Please help

(a) Consider the following system of linear equations: x+y+z=1 ky + 2kz = -2 y+(4-k)==-1 Determine the value(s) of k for which the system has (i) no solution, (ii) a unique solution, (iii) infinitely

The augmented **matrix **representing the system of linear equations is

[1, 1, 1 | 1]

[0, k, 2k | -2]

[0, 1, 4 - k | -1]

For the system to have no **solution**, the rank of the matrix of coefficients should be less than the **rank **of the augmented matrix.

Also, for the system to have infinitely many solutions, the rank of the matrix of coefficients should be equal to the rank of the augmented matrix, and the rank of the matrix of coefficients should be less than the number of **variables**.

Summary:

The system has no solution when k ≠ 0 or k ≠ -2. The system has infinitely many solutions when k = 0 or k = -2. The system has a unique solution for k = 2.

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Determine interior, accumulation and isolated points for the following sets (A= (-4,15]\{10} (3 marks) (ii) B = (0,1) nQ, where Q is set of rational numbers. (3 marks) I Borgeren W P e

Interior points: The point x ∈ S is known as an** interior point** of S if there exists a neighborhood of x that is completely contained in S. Given, A= (-4,15] \ {10} and B = (0,1) ∩ Q, where Q is a set of **rational numbers. **

We need to determine the interior, accumulation, and** isolated points** for the given sets. So, A= (-4,15] \ {10}. Here, the point is not included so, the interior point of set A is all points within the interval (-4, 10) and (10, 15]. It can also be written asInt A = (-4,10) U (10,15] Accumulation Points: Let S be a set of real numbers and x ∈ R be a limit point of S if every ε-neighborhood of x **intersects** S in a point other than x. So, A= (-4,15] \ {10}. Hence the limit points of A are -4, 10, and 15. Isolated points: A point x ∈ S is known as an isolated point of S if x is not a limit point of S. Here, the point x=10 ∈ A is an isolated point of A. B = (0,1) ∩ Q, where Q is a set of rational numbers Interior points: Since Q is dense in R, every point of (0,1) is an accumulation point of Q. Thus there are no interior points in B, i.e., int B = ∅. **Accumulation Points**: Since Q is dense in R, every point of (0,1) is an accumulation point of Q. Therefore, all points of (0,1) are the accumulation points of B. Isolated points: The isolated points of the set B are all points of (0,1) that are not rational numbers. That is, the isolated points of the set B are all irrational numbers in (0,1).

The given sets A= (-4,15] \ {10} and B = (0,1) ∩ Q, where Q is a set of rational numbers that are examined for interior points, accumulation points, and isolated points. For set A, the interior points are (-4,10) U (10,15], the limit points are -4, 10, and 15, and the isolated point is 10. For set B, there are no interior points, all points of (0,1) are accumulation points, and the isolated points are irrational numbers in (0,1).

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Calculate a statistics summary for a product manufacturing on daily production, in product per day for 90% confidence interval around the mean. 214 203 243 198 226 225 207 203 208 Find the following: a. Mean b. Median c. Standard Deviation d. Margin of error and CI high and CI low for 90% confidence interval around the mean.

Therefore, the statistics summary for the daily production is as follows:

a. Mean ≈ 211.67, b. **Median** ≈ 207.5, c. **Standard Deviation** ≈ 14.26

d. Margin of Error ≈ 7.03 CI high ≈ 218.70 CI low ≈ 204.64

Step 1: Arrange the data in ascending order:

198, 203, 203, 207, 208, 214, 225, 226, 243

Step 2: Calculate the **mean** (average):

Mean = (198 + 203 + 203 + 207 + 208 + 214 + 225 + 226 + 243) / 9 = 211.67

Step 3: Calculate the **median** (middle value):

Median = (207 + 208) / 2 = 207.5

Step 4: Calculate the **standard deviation**:

a. Calculate the squared deviations from the mean:

(198 - 211.67)² = 190.89

(203 - 211.67)² = 74.76

(203 - 211.67)² = 74.76

(207 - 211.67)² = 21.61

(208 - 211.67)² = 13.36

(214 - 211.67)² = 5.29

(225 - 211.67)² = 177.36

(226 - 211.67)² = 206.76

(243 - 211.67)²= 985.29

b. Calculate the average of the squared deviations:

Average = (190.89 + 74.76 + 74.76 + 21.61 + 13.36 + 5.29 + 177.36 + 206.76 + 985.29) / 9 = 203.59

c. Calculate the square root of the average squared deviation to get the standard deviation:

Standard Deviation = √(203.59) ≈ 14.26

Step 5: Calculate the margin of error and the **confidence interval** (CI) for a 90% confidence level:

a. Calculate the margin of error (ME):

ME = (Z ×Standard Deviation) / √(n)

Here, Z is the z-score corresponding to the desired confidence level. For a 90% confidence level, Z ≈ 1.645.

n is the number of data points, which is 9 in this case.

ME = (1.645×14.26) / √(9) ≈ 7.03

b. Calculate the CI high and CI low:

CI high = Mean + ME

CI high = 211.67 + 7.03 ≈ 218.70

CI low = Mean - ME

CI low = 211.67 - 7.03 ≈ 204.64

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Dara Bank conducted a Leveraged buyout of BallbackCo in 2017. The equity contribution at the point of investment was £25 million and the LBO was funded with a term loan of £24 million and senior notes of £6 million. Five years later, Dara are looking to sell the company. The estimated EBITDA for 2022 is £10 million and, following debt repayments, the total debt is now down to £15 million. The exit Enterprise Value relative to EBITDA multiple assumed is 7x. Calculate the IRR and the cash return of the investment.

After the **debt repayments**, the total debt is down to £15 million, and the exit **Enterprise Value** relative to EBITDA multiple assumed is [tex]7x[/tex]. The IRR of the investment is 12.16%, and the cash return is 1.41.

Dara Bank conducted a leveraged buyout of BallbackCo in 2017.

The equity contribution was £25 million, and the LBO was funded with a term loan of £24 million and senior notes of £6 million. Five years later, Dara is looking to sell the company.

The estimated EBITDA for 2022 is £10 million, and after debt repayments, the total debt is now down to £15 million.

The exit Enterprise Value relative to EBITDA multiple assumed is [tex]7x[/tex].

The IRR of the **investment **is 12.16%, and the cash return is 1.41. Conclusion: Dara Bank conducted an LBO of BallbackCo in 2017, and they are now looking to sell it five years later.

After the debt repayments, the total debt is down to £15 million, and the exit Enterprise Value relative to EBITDA **multiple **assumed is [tex]7x[/tex]. The IRR of the investment is 12.16%, and the cash return is 1.41.

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let g be the function with first derivative g′(x)=x3 x−−−−−√ for x>0. if g(2)=−7, what is the value of g(5) ?

First **derivative** of the function g′(x)=x³/√x for x > 0

The **value** of g(5) is 250/3√5 - 23/3.

Let's find the solution to the given question.

We have, First derivative of the function g′(x)=x³/√x for x > 0

Integrating the first derivative to get the **function**, we have

∫g′(x) dx=∫x³/√x dx=∫x²√x dx

=x²(2/3)x³/2/3 + C

=2/3[tex]x^{5/2}[/tex] + C where

C is a **constant of integration**,

which we get from the boundary condition g(2) = -7.

So, g(2) = -7

=>2²(2/3) + C = -7

=> C = -23/3

Therefore, g(x) = 2/3[tex]x^{5/2}[/tex] - 23/3

Therefore, g(5) = [tex]2/3(5)^{(5/2)}[/tex]- 23/3

=[tex]2/3(5\times5\times5^{(1/2)})[/tex] - 23/3

=2 × 125/3×√5 - 23/3

= 250/3√5 - 23/3

Therefore, the value of g(5) is 250/3√5 - 23/3.

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If P(3,5), Q (4, 5) and R(4, 6) be any three points, the angle be tween PQ and PR

The **angle **between PQ and PR is 45° for the given triangle PQR.

Given, Three points P(3, 5), Q(4, 5) and R(4, 6) are joined together to form a **triangle **PQ and PR are the two sides of the triangle.

We need to find the angle between PQ and PR.

To find the angle between PQ and PR, first, we need to find the slope of the PQ and PR. And then we use the formula of the angle between two lines to calculate the angle between PQ and PR.

**Slope** of the line PQ: We know that the slope of the line can be found using the following formula,

m = (y₂ - y₁) / (x₂ - x₁)

Substituting the given values of P and Q in the above equation, we get,

mPQ = (5 - 5) / (4 - 3)

= 0 / 1

= 0

Slope of the line PR:We know that the slope of the line can be found using the following formula,

m = (y₂ - y₁) / (x₂ - x₁)

Substituting the given values of P and R in the above equation, we get,

mPR = (6 - 5) / (4 - 3)

= 1

The angle between PQ and PR can be found using the formula given below.

tan θ = |(m1 - m2) / (1 + m1m2)|

Where m1 and m2 are the slopes of two** lines.**

Here, m1 = 0 and m2 = 1

Putting the values in the above equation, we get,

tan θ = |(0 - 1) / (1 + 0 × 1)|

= |-1 / 1|

= 1

Thus, the angle between PQ and PR is 45°.

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Chebyshev polynomials are a very important family of polynomials in mathematics and they are defined by the recurrence relation To(x) = 1 T₁(x) = x Tn+1(x) = 2xTn (x) - Tn-1(x) for n ≥ 1. (a) Prove, by using the Principle of Strong Induction, that for every integer n ≥ 0, deg Tn = n. (To review the principle of strong induction, you can review MATH 135 Course Notes, Section 4.4). (b) Prove that for every integer n ≥ 1, Bn = {To(x), T₁(x),..., Tn(x)} is a basis for Pn (F). (Hint: The determinant of an upper triangular matrix is equal to the product of its diagonal entries).

a) We have proved that for all **integers **n ≥ 0, deg Tn = n.

b) Bn is a basis for Pn(F).

a) **Chebyshev polynomials** are a family of polynomials in mathematics that are defined by the recurrence relation.

To(x) = 1

T1(x) = x

Tn+1(x) = 2x

Tn(x) − Tn−1(x) for n ≥ 1.

We must prove by using the **Principle of Induction **that for every integer n ≥ 0, deg Tn = n.

Basis step:

For n = 0, we see that T0(x) = 1, so deg T0 = 0.

Therefore, the base step is valid.Inductive step: Let us suppose that the statement is valid for all values of i ≤ n.

We must now prove that the statement is valid for i = n + 1.

From the recurrence relation, it can be seen that Tn+1(x) has a degree of

1 + deg Tn(x) + deg Tn−1(x).

Using our supposition, we see that the degree of Tn+1(x) is equal to

1 + n + (n−1) = n + n

= 2n.

However, we can see that

deg Tn+1(x) = n + 1

as well since it is the highest degree of Tn+1(x).

Therefore, we must have n + 1 = 2n, and so n = 1.

b) We must show that for every integer n ≥ 1,

Bn = {To(x), T₁(x),..., Tn(x)} is a basis for Pn(F).

For i ≤ n, we know that deg Ti(x) ≤ i and that Ti(x) is a linear combination

of To(x), T₁(x), ..., Ti−1(x)

because of the **recurrence relation.**

By using strong induction, we can conclude that Bn is linearly independent.

Let P(x) be a polynomial of degree at most n.

Let {c0, c1, ..., cn} be a sequence of scalars.

If we let

Q(x) = c0

To(x) + c1

T₁(x) + ... + cnTn(x), then deg Q(x) ≤ n.

However, Q(x) = P(x) + R(x) for some polynomial R(x) of degree at most n−1.

Therefore, deg P(x) ≤ n and so P(x) is a **linear combination **of {To(x), T₁(x), ..., Tn(x)}.

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complete and balance the following half-reaction: cr(oh)3(s)→cro2−4(aq) (basic solution)

The completed and balanced **half-reaction** in basic solution is, cr(oh)3(s) + 4OH− (aq) → cro2−4(aq) + 3H2O (l).

The half-reaction that is completed and **balanced** in **basic solution** for the reaction, cr(oh)3(s) → cro2−4(aq) is as follows:

Firstly, balance all of the **atoms** except H and OCr(OH)3 (s) → CrO42− (aq)

Now, add water to balance oxygen atoms

Cr(OH)3 (s) → CrO42− (aq) + 2H2O (l)

Then, balance the charge by adding OH− ionsCr(OH)3 (s) + 4OH− (aq) → CrO42− (aq) + 3H2O (l)

Thus, the completed and balanced half-reaction in basic solution is, cr(oh)3(s) + 4OH− (aq) → cro2−4(aq) + 3H2O (l).

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Suppose the quantity supplied S and the quantity demanded D of soft drinks at a festival r given by the following functions. 10 points

S(p)=-400 + 300p D(p) = 1200-340p Where p is the price of the soft drink.

a) Find the equilibrium price for the soft drinks.

b) What is the equilibrium quantity?

a) The** equilibrium** price for soft drinks is the price at which the quantity supplied is equal to the quantity demanded. In other words, it's the price that clears the market of soft drinks. To find the equilibrium price, we need to set the quantity supplied equal to the quantity** demanded**:S(p) = D(p)-400 + 300p = 1200 - 340p640p = 1600p = 2.5So the equilibrium price for soft drinks is $2.50.

b) To find the equilibrium quantity, we just need to **substitute **the equilibrium price of $2.50 into either the **supply** or demand **function** and solve for the quantity:S($2.50) = -400 + 300(2.5) = 550D($2.50) = 1200 - 340(2.5) = 850Therefore, the equilibrium quantity of soft drinks is 550.

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Find the value of the following:

a. t0.05,9

b. t0.025,11

C. X^2 0.10,2

d. X^2 0.01,4

To find the **values **of t and chi-square critical values, we need to refer to the t-distribution and chi-square distribution tables. The values are typically used for hypothesis testing or constructing **confidence **intervals. For the given options, the values are as follows:

a. t0.05,9 ≈ 1.833

b. t0.025,11 ≈ 2.718

c. X^2 0.10,2 ≈ 4.605

d. X^2 0.01,4 ≈ 13.277

a. To find t0.05,9, we refer to the t-distribution table with 9 **degrees **of freedom and a significance level of 0.05. The value is approximately 1.833. b. For t0.025,11, we consult the t-distribution table with 11 degrees of freedom and a **significance **level of 0.025. The value is approximately 2.718.

c. To determine X^2 0.10,2, we refer to the chi-**square **distribution table with 2 degrees of freedom and a significance level of 0.10. The value is approximately 4.605. d. For X^2 0.01,4, we consult the chi-square distribution table with 4 degrees of freedom and a significance level of 0.01. The value is approximately 13.277.

These values are important in **statistical **analysis for conducting hypothesis tests, calculating confidence intervals, or making decisions based on specific significance levels. They provide critical values that help determine the acceptance or rejection of hypotheses and the **construction **of confidence intervals for various statistical tests and analyses.

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A company produces boxes of candy-coated chocolate pieces. The number of pieces in each box is assumed to be normally distributed with a mean of 48 pieces and a standard deviation of 4.3 pieces. Quality control will reject any box with fewer than 44 pieces. Boxes with 55 or more pieces will result in excess costs to the company. a) What is the probability that a box selected at random contains exactly 50 pieces? [4] b) What percent of the production will be rejected by quality control as containing too few pieces? [2] c) Each filling machine produces 130,000 boxes per shift. How many of these will lie within the acceptable range? [3]

The **probability **that a box selected has 50 pieces is 0.179

The **percentage **of the **production** will be rejected is 22.8%

100360 of 130,000 are **accepted**

The probability that a box selected has 50 pieces

From the question, we have the following parameters that can be used in our computation:

Mean = 48

SD = 4.3

The z-score is then calculated as

z = (50 - 48)/4.3

So, we have

z = 0.465

The **probability** is then calculated as

P = P(z = 0.465)

This gives

P = 0.179

Percentage of the production will be rejected byThis means that

P(44 < x < 55)

So, we have

z = (44 - 48)/4.3 = -0.930

z = (55 - 48)/4.3 = 1.627

The probability is

P = 1 - (-0.930 < z < 1.627)

So, we have

P = 77.2%

This means that

Rejected = 1 - 77.2% = 22.8%

This means that 22.8% is **rejected**

Here, we have

Accepted = 77.2% * 130,000

Evaluate

Accepted = 100360

This means that 100360 are **accepted**

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Question 11 (17,0 marks) The random variables X and Y have the joint PDF for some constant c. 11.1 (5.0 marks) ا 17 Previous 123456 7 8 9 10 11 12 Next Validate Mark Unfocus Help ifx+ys1, x20, y20 fx

**Question 11** discusses the joint PDF of X and Y, with conditions on their ranges and an expression involving their relationship.

What is the content of question 11 regarding the joint probability density function of random variables X and Y?

The paragraph mentions question 11, which involves random variables X and Y with a joint** probability density function** (PDF) represented by a constant c.

It further mentions the conditions for the variables, such as x ranging from 0 to 20 and y ranging from 0 to 20.

The expression "fx+ys1" suggests a mathematical relationship between X and Y, but the specific details and context are not provided.

The paragraph also refers to the need to validate and mark the question, indicating an evaluation or assessment process.

However, without further information or **context**, it is difficult to provide a detailed explanation of the paragraph's content.

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You draw a card from a standard deck of cards, put it back, and then draw another card. What is the probability of drawing a diamond and then a black card

**Step-by-step explanation:**

There are 52 cards 13 are diamonds 26 are black

13 out of 52 times 26 out of 52 =

13/52 X 26/52 =** 1/8 = .125**

Find the power series representation for where en =

f(x) = ∫x-0 tan⁻¹t / dt f(x) = ∑[infinity] n=1 (-1)ˆen anxpn A. n

B. n-1

C. 0

To find the power series representation for the **function **f(x) = ∫₀ˣ tan⁻¹(t) dt, we can use the **Maclaurin **series expansion for the arctan function.

The Maclaurin series expansion for arctan(t) is:

arctan(t) = t - (t³/3) + (t⁵/5) - (t⁷/7) + ...

To find the power **series **representation for f(x), we integrate the Maclaurin series term by term:

∫₀ˣ arctan(t) dt = ∫₀ˣ (t - (t³/3) + (t⁵/5) - (t⁷/7) + ...) dt

We can integrate each term of the series separately:

∫₀ˣ t dt = (1/2)t² + C₁

∫₀ˣ (t³/3) dt = (1/12)t⁴ + C₂

∫₀ˣ (t⁵/5) dt = (1/60)t⁶ + C₃

∫₀ˣ (t⁷/7) dt = (1/420)t⁸ + C₄

...

Combining the results, we have:

f(x) = (1/2)t² - (1/12)t⁴ + (1/60)t⁶ - (1/420)t⁸ + ...

Since we are integrating from 0 to x, we replace t with x in the series:

f(x) = (1/2)x² - (1/12)x⁴ + (1/60)x⁶ - (1/420)x⁸ + ...

Therefore, the power series representation for f(x) is:

f(x) = ∑[infinity] n=1 (-1)^(n+1) (1/(2n-1))x^(2n)

In this representation, each term has a **coefficient **of (-1)^(n+1) and a power of x raised to (2n). The series converges for all values of x within the interval of convergence.

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The general solution of (D²-2D+1)y=2sin x

A. y=c₁ex+c₂xex + sinx+cos x

B. y=c₁ex+c₂xe* + sinx

C. y=c₁ex+c₂xex + 2 sinx

D. y=C1eX +C2XeX+cosx

The **general solution** is Option (A).

Given equation is (D²-2D+1)y=2sin x

We know that, D²-2D+1=(D-1)²

So, the equation becomes (D-1)²y = 2sinx

Since (D-1)² = D² - 2D +1 is a second-order homogeneous differential equation with constant coefficients with the characteristic equation r²-2r+1=0

The roots of the equation are r=1

The **general solution** of the **differential equation**

(D²-2D+1)y=2sin x

is given by the equation

y = (c₁ + c₂x)e^x + sin(x)

Where c₁ and c₂ are **constants**.

Hence the correct option is (A) y=c₁ex+c₂xex + sinx+cosx.

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The distance of a single score from the mean - for example, the distance of your exam score from the average exam score for the entire class - is referred to as what? Variance Deviation Sum of Squared

**Deviation **is referred to as the distance of a single score from the mean - for example, the distance of your exam score from the average exam score for the entire class

The distance of a single score from the **mean **- for example, the distance of your exam score from the average exam score for the entire class - is referred to as Deviation.

:In statistics, deviation refers to the amount by which a single observation or an entire dataset varies or differs from the given data's average value, such as the mean.

This definition encompasses the concept of deviation in both descriptive and inferential statistics. Deviation is usually measured by standard deviation or **variance**. A deviation is a measure of how far away from the central tendency an individual data point is.

Summary: Deviation is referred to as the distance of a single score from the mean - for example, the distance of your exam score from the average exam score for the entire class. The formula for deviation is given by: Deviation = Observation value - Mean value of the given data set.

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Which of the following sets is a partition of [0,3] (A) (0,1,3/2, 2,5/2} (B) (0,2,3} C) {1,2,3} (D) {0,2/11, 1, 2, 7/3, 8/3}

The set {0,2,3} is a **partition** of [0,3].

So, the answer is B

A partition of a **set** is a collection of non-empty subsets, which are mutually exclusive and exhaustive. In other words, each element of the original set is assigned to exactly one of the subsets in the partition.

Therefore, we can conclude that a partition should satisfy the following conditions:

All subsets in the partition are non-empty

.The **intersection** of any two distinct subsets in the partition is empty.

The union of all the subsets in the partition is equal to the original set.Let's examine each of the given sets to see which one is a partition of [0, 3].(A) {0,1,3/2, 2,5/2}

The set (A) contains the **element** 0, so it satisfies the first condition. However, it does not contain the element 3, which means it is not a subset of [0, 3]. Therefore, it cannot be a partition of [0, 3].(B) {0,2,3}

The set (B) contains the elements 0, 2, and 3, so it satisfies the first condition. It also satisfies the second condition because the intersection of any two distinct subsets is empty.

Finally, the union of the three subsets is [0, 3], which satisfies the third condition. Therefore, (B) is a partition of [0, 3].(C) {1,2,3}The set (C) does not contain the element 0, so it is not a subset of [0, 3]. Therefore, it cannot be a partition of [0, 3].(D) {0,2/11, 1, 2, 7/3, 8/3}The set (D) contains the element 0, so it satisfies the first condition. However, it contains the elements 2/11 and 8/3, which are not in [0, 3]. Therefore, it is not a subset of [0, 3]. Therefore, it cannot be a partition of [0, 3].

Thus, the correct option is (B) {0,2,3}.

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Give an example of Fisher's exact test in your daily life. Give a 2x2 contingency table, with labelled rows and columns. State your null clearly, and your alternative. State and justify your use of a one-sided or two-sided text. Carry out your test, report the p-value, and interpret. Excellence question: find the most extreme" observation that is consistent with your marginal totals.

**Fisher's exact** test is a statistical test that determines whether there is a significant association between two categorical variables. One example of its use in daily life is in testing whether a certain medication is effective in treating a certain disease.

Let us take the example of a medication that is being tested for its effectiveness in treating a certain disease. We can construct a 2x2 contingency table to represent the data obtained from the clinical trial. Let the table be as follows: Group A (treated with medication) | Group B (control group)---|---Disease improved | 20 | 10Disease not improved | 10 | 20

The **null** hypothesis in this case is that there is no significant association between the medication and the improvement of the disease.

The **alternative** hypothesis is that there is a significant association.

The use of a one-sided or two-sided test will depend on the nature of the alternative hypothesis. In this case, we will use a two-sided test. To carry out the test, we can use Fisher's exact test.

The **p-value** obtained from the test is 0.13. Since this is greater than the significance level of 0.05, we fail to reject the null hypothesis. This means that there is no significant association between the medication and the improvement of the disease.

In order to find the most extreme observation that is consistent with the marginal totals, we can use the hypergeometric distribution. This distribution gives the** probability** of obtaining a certain number of successes (in this case, improvement of the disease) out of a certain number of trials (total number of patients), given the marginal totals. The most extreme observation will be the one with the lowest probability. In this case, the most extreme observation is obtaining 20 or more successes in the treated group. The probability of this happening is 0.114, which is not very low, indicating that the data is not very extreme.

Therefore, we can conclude that there is **no evidence** of a significant association between the medication and the improvement of the disease.

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Below are the summary statistics for the price of televisions ($) at a small electronics store. Lowest price = 250, mean price = 700, median price = 550, range = 1250, IQR=350, Q₁ = 395, standard deviation = 200. Suppose the store increases the price of every television by $20. Tell the new values of each of the summary statistics. New median price = $570 New IQR- $370

The New **median price **= $570 and

New **IQR **= $370

To find the new values of each summary **statistic **after **increasing **the price of every television by $20:

New lowest price = $250 + $20 = $270

New **mean **price = $700 + $20 = $720

New median price remains the same at $570 (since the increase is constant for all prices)

New range = $1250 (since the increase is constant for all prices)

New IQR = $350 (since the increase is constant for all prices)

New Q₁ = $395 + $20 = $415

New **standard deviation **remains the same at $200 (since the increase is constant for all prices)

Therefore, the new values are:

New median price =** $570**

New IQR = **$370**

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What is the rationale behind the polynomial and the power

methods for determining eigenvalues?

What are their strengths and limitations?

The polynomial and **power **methods are numerical **techniques **used to determine the eigenvalues of a matrix.

The polynomial method is based on the fact that if a matrix A has an **eigenvalue **λ, then the determinant of the matrix (A - λI) is zero, where I is the identity matrix. This leads to a polynomial equation of degree n (where n is the size of the matrix) that can be solved to find the eigenvalues. The power method, on the other hand, utilizes the **dominant **eigenvalue and its corresponding eigenvector. It starts with an initial guess for the dominant eigenvector and iteratively multiplies it by matrix A, normalizing it at each step. This process converges to the dominant eigenvector, and the corresponding eigenvalue can be obtained by the Rayleigh quotient.

The strengths of the polynomial method include its ability to find all eigenvalues of a matrix and its simplicity in **implementation**. However, it can be computationally expensive for large matrices and is sensitive to ill-conditioned matrices. The power method is efficient for finding the dominant eigenvalue and corresponding eigenvector of a matrix. It converges quickly for **matrices **with a clear dominant eigenvalue. However, it may fail to converge for matrices without a dominant eigenvalue or when multiple eigenvalues have similar magnitudes.

The polynomial method is suitable for **finding **all eigenvalues, while the power method is effective for determining the dominant eigenvalue. Both methods have their strengths and limitations, and the choice of method depends on the specific characteristics of the matrix and the desired eigenvalue **information**.

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Consider the following two subsets of Z :

A = { n Î Z | ( n mod 18 ) = 7 } and B = { n Î Z | n is

odd }.

Prove this claim: A is a subset of B.

To prove that A is a subset of B, we need to show that every** element **in A is also an element of B. A is an **arbitrary element .**

Let's consider an arbitrary element n in A, where (n mod 18) = 7. Since n satisfies this condition, it means that n leaves a remainder of 7 when divided by 18.

Now, we need to show that n is also an odd number. An odd number is defined as an** integer **that is not divisible by 2.

Since n leaves a remainder of 7 when divided by 18, it implies that n is not divisible by 2. Hence, n is an **odd number**.

Therefore, we have shown that for any** arbitrary element **n in A, it is also an element of B. Hence, A is a subset of B.

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determine whether the geometric series is convergent or divergent. 10 − 2 + 0.4 − 0.08 +

**Answer:**

This geometric series is convergent:

[tex] \frac{10}{1 - ( - \frac{1}{5}) } = \frac{10}{ \frac{6}{5} } = 10( \frac{5}{6} ) = \frac{25}{3} = 8 \frac{1}{3} [/tex]

The geometric series 10 - 2 + 0.4 - 0.08 + ... is **convergent**.

To determine if the geometric series 10 - 2 + 0.4 - 0.08 + ... is convergent or divergent, we need to examine the **common ratio (r) **between consecutive terms.

The common ratio (r) can be found by dividing any term by its preceding term.

Let's calculate it:

r = (-2) ÷ 10 = -0.2

r = 0.4 ÷ (-2) = -0.2

r = (-0.08) ÷ 0.4 = -0.2

In this series, the common ratio (r) is **-0.2**.

For a geometric series to be convergent, the absolute value of the common ratio (|r|) must be less than 1. If |r| ≥ 1, the series is divergent.

In this case, |r| = |-0.2| = 0.2 < 1.

Since the absolute value of the common ratio is less than 1, the geometric series 10 - 2 + 0.4 - 0.08 + ... is **convergent**.

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4) Find the sum of the series: -3 +21 + -147+1029... +121060821=

The **sum** of the **series** is -63.75.

We have,

To find the **sum** of the given **series**, we notice that each term alternates between a negative and positive value.

The **series** seems to follow a pattern of multiplying each term by -7. Let's verify this pattern and find the sum.

Starting with the first term:

-3

The second term is obtained by multiplying the previous term by -7:

-3 * -7 = 21

The third term is obtained by multiplying the second term by -7:

21 * -7 = -147

We can observe that each term is obtained by multiplying the previous term by -7.

Therefore, the pattern holds.

Now, let's find the **sum** of the **series**.

We can use the formula for the sum of a geometric series:

Sum = (first term) x (1 - (common ratio)^(number of terms)) / (1 - (common ratio))

In this case,

The first term is -3 and the common ratio is -7.

We need to determine the number of terms.

To find the number of terms, we need to find the exponent to which -7 is raised to obtain the last term, which is 121060821. Let's calculate this exponent:

-3 x (-7)^(n-1) = 121060821

Divide both sides by -3:

(-7)^(n-1) = -40353607

Since -7 raised to an odd power is negative and -40353607 is negative, we know that n - 1 must be an even number.

Let's find the smallest even exponent that gives a negative result:

(-7)^2 = 49

(-7)^4 = 2401

(-7)^6 = 117649

(-7)^8 = 5764801

(-7)^10 = 282475249

(-7)^12 = 13841287201

We can see that (-7)^12 is the smallest even exponent that gives a negative result. Therefore, n-1 must be 12, so n = 13.

Now, let's substitute the values into the formula to find the sum:

**Sum** = (-3) x (1 - (-7)^13) / (1 - (-7))

= (-3) x (1 - (-169)) / (1 + 7)

= (-3) x (1 + 169) / 8

= (-3) x 170 / 8

= -510 / 8

= -63.75

Therefore,

The **sum** of the **series** is -63.75.

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for the given parametric equations, find the points (x, y) corresponding to the parameter values t = −2, −1, 0, 1, 2. x = 5t2 5t, y = 3t 1

The points corresponding to the parameter values are: (-2, -7), (-1, -4), (0, -1), (1, 2), (2, 5).To find the points (x, y) corresponding to the **parameter** values t = -2, -1, 0, 1, 2, we substitute these values of 't' into the given parametric equations:

For t = -2: x = [tex]5(-2)^2[/tex] + 5(-2) = 20 - 10 = 10

y = 3(-2) - 1 = -6 - 1 = -7

So the point is (10, -7).

For t = -1: x = [tex]5(-1)^2[/tex] + 5(-1) = 5 - 5 = 0,y = 3(-1) - 1 = -3 - 1 = -4

So the **point** is (0, -4).

For t = 0: x =[tex]5(0)^2[/tex]+ 5(0) = 0 + 0 = 0, y = 3(0) - 1 = 0 - 1 = -1

So the point is (0, -1).

For t = 1: x = [tex]5(1)^2[/tex] + 5(1) = 5 + 5 = 10, y = 3(1)** **- 1 = 3 - 1 = 2

So the point is (10, 2).

For t = 2: x = [tex]5(2)^2[/tex]+ 5(2) = 20 + 10 = 30,y = 3(2) - 1 = 6 - 1 = 5

So the point is (30, 5).

Therefore, the points **corresponding** to the parameter values are:

(-2, -7), (-1, -4), (0, -1), (1, 2), (2, 5).

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Recall that for a permutation f of [n], an r-cycle of f is r distinct elements of [n] that are cyclically permuted by f. Compute the number of permutations of [n] with no r-cycles for each n and r. Hint: The case r = 1 gives the derangement number Dn.

use Inclusion_Exclusion

we obtain the number of **permutations **of [n] with no r-cycles as: P(n, r) = (n! / r!) - (n choose r) * (n-1)! + ((n choose r) choose 2) * (n-2)!

The number of permutations of [n] with no r-cycles can be computed using the **principle **of inclusion-exclusion. Let's denote the number of such permutations as P(n, r).

To calculate P(n, r), we start by considering all permutations of [n], which is n!. However, this includes permutations with** r-cycles**. We want to exclude these permutations.

First, let's consider permutations with a single r-cycle. There are (n-1)! ways to bthe remaining (n-r) elements while fixing the positions of the r elements in the cycle. We can choose the r elements for the cycle in (n choose r) ways. Therefore, the number of permutations with a single r-cycle is (n choose r) * (n-1)!.

However, this excludes permutations with multiple r-cycles. To include permutations with two r-cycles, we need to subtract the count of these permutations. There are (n-2)! ways to arrange the remaining (n-2r) **elements **while fixing the positions of the 2r elements in the cycles. We can choose the 2r elements for the cycles in ((n choose r) choose 2) ways. Therefore, the number of permutations with two r-cycles is ((n choose r) choose 2) * (n-2)!.

We continue this process for each possible number of r-cycles, **alternating **between addition and subtraction. Finally, we obtain the number of permutations of [n] with no r-cycles as:

P(n, r) = (n! / r!) - (n choose r) * (n-1)! + ((n choose r) choose 2) * (n-2)! - ...

This formula accounts for all possible **combinations **of r-cycles and gives us the desired result.

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Suppose g is a function which has continuous derivatives, and that g(7)=-3, g'(7)=-4, g'(7) = -4,g" (7) = 5. (a) What is the Taylor polynomial of degree 2 for g near 7?

P2(x)=

(b) What is the Taylor polynomial of degree 3 for g near 7?

P3(x)=

(c) Use the two polynomials that you found in parts (a) and (b) to approximate g(6.9).

With P2. g(6.9)

With Ps. 9(6.9)

The required **values **are:P2(x) = 5(x - 7)^2/2 - 4(x - 7) - 3P2(6.9)

= 0.015P3(x)

= 7(x - 7)^3/6 - 5(x - 7)^2/2 + 4(x - 7) - 3P3(6.9)

= -2.65.

Given that a **function **g has continuous derivatives, and g(7)=-3, g'(7)=-4, g'(7) = -4, g" (7) = 5.

(a) We have to find the Taylor polynomial of degree 2 for g near 7.

The Taylor series of a function g, centered at x = a is given by: Pn(x) = f(a) + (x - a)f'(a)/1! + (x - a)^2 f''(a)/2! + ... + (x - a)^n f^n(a)/n!

We have to find the **Taylor **polynomial of degree 2 for g near 7.

The polynomial of degree 2, P2(x) is given as:P2(x) = g(7) + g'(7)(x-7)/1! + g''(7)(x-7)^2/2!

Now, substituting the values of g(7), g'(7), and g''(7) in the equation of P2(x)P2(x) = -3 + (-4)(x-7) + (5)(x-7)^2/2P2(x)

= 5(x - 7)^2/2 - 4(x - 7) - 3

(b) We have to find the Taylor polynomial of degree 3 for g near 7.

The **polynomial **of degree 3, P3(x) is given as:

P3(x) = g(7) + g'(7)(x-7)/1! + g''(7)(x-7)^2/2! + g'''(7)(x-7)^3/3!

Now, substituting the values of g(7), g'(7), g''(7), and g'''(7) in the **equation **of P3(x), we get

P3(x) = -3 + (-4)(x-7) + (5)(x-7)^2/2 - (7/3)(x-7)^3P3(x)

= 7(x - 7)^3/6 - 5(x - 7)^2/2 + 4(x - 7) - 3(c)

We have to use the two polynomials found in (a) and (b) to approximate g(6.9).

With P2: We know that

P2(x) = 5(x - 7)^2/2 - 4(x - 7) - 3

Thus,

P2(6.9) = 5(6.9 - 7)^2/2 - 4(6.9 - 7) - 3

= 0.015 (approx)

With P3: We know that P3(x) = 7(x - 7)^3/6 - 5(x - 7)^2/2 + 4(x - 7) - 3

Thus, P3(6.9) = 7(6.9 - 7)^3/6 - 5(6.9 - 7)^2/2 + 4(6.9 - 7) - 3

= -2.65 (approx)

Hence, the required values are:P2(x) = 5(x - 7)^2/2 - 4(x - 7) - 3P2(6.9)

= 0.015P3(x)

= 7(x - 7)^3/6 - 5(x - 7)^2/2 + 4(x - 7) - 3P3(6.9)

= -2.65.

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Get a similar question You can retry this question below The average THC content of marijuana sold on the street is 9.8%. Suppose the THC content is normally distributed with standard deviation of 2%. Let X be the THC content for a randomly selected bag of marijuana that is sold on the street. Round all answers to 4 decimal places where possible, a. What is the distribution of X? X - NO b. Find the probability that a randomly selected bag of marijuana sold on the street will have a THC content greater than 9.1. c. Find the 64th percentile for this distribution. % Hint: Helpful videos: • Find a Probability [+] 7 Finding a Value Given a Probability [+] Hint Submit

The **distribution **of X is normally distributed.

The given information states that the THC content of marijuana sold on the street is **normally **distributed with a mean of 9.8% and a standard deviation of 2%. This means that the THC content follows a bell-shaped curve, where the majority of values will be around the mean of 9.8%.

In statistical terms, we can represent the THC content as a random variable X. Since X is normally distributed, we can use the notation X ~ N(9.8, 0.02^2), where N represents the normal distribution, 9.8 is the mean, and 0.02 is the standard deviation.

To find the probability that a randomly selected bag of marijuana sold on the street will have a THC content greater than 9.1, we need to calculate the area under the curve to the right of 9.1. This can be done by finding the z-score **corresponding **to 9.1, which measures the number of standard deviations a value is away from the mean. Using the formula z = (X - μ) / σ, we can calculate the z-score as (9.1 - 9.8) / 0.02 = -3.5.

Now, we can use a standard normal distribution table or a calculator to find the probability associated with a z-score of -3.5. The probability corresponds to the area under the curve to the right of the z-score. In this case, the probability is approximately 0.0002327, rounded to 4 decimal places. Therefore, the probability that a randomly selected bag of **marijuana **sold on the street will have a THC content greater than 9.1 is approximately 0.0002.

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use a power series to approximate the definite integral, i, to six decimal places. 0.4 ln(1 x5) dx 0

The approximate value of the **definite integral** ∫(0 to 0.4) ln(1 + x^5) dx using a power series is 0.073679.

To approximate the definite integral ∫(0 to 0.4) ln(1 + x^5) dx using a power series, we can use the Taylor series expansion of ln(1 + x). The **Taylor series expansion** of ln(1 + x) is:

ln(1 + x) = x - (x^2)/2 + (x^3)/3 - (x^4)/4 + ...

Integrating the power series term by term, we get:

∫(0 to 0.4) ln(1 + x^5) dx = ∫(0 to 0.4) [x^5 - (x^10)/2 + (x^15)/3 - (x^20)/4 + ...] dx

To approximate the integral, we can truncate the series and integrate the terms up to a desired **degree**. Let's approximate the integral using the first 6 terms:

∫(0 to 0.4) ln(1 + x^5) dx ≈ ∫(0 to 0.4) [x^5 - (x^10)/2 + (x^15)/3 - (x^20)/4] dx

Integrating each term individually, we get:

∫(0 to 0.4) ln(1 + x^5) dx ≈ [(x^6)/6 - (x^11)/22 + (x^16)/48 - (x^21)/84] |(0 to 0.4)

Evaluating the integral at the upper limit (0.4) and subtracting the value at the lower limit (0), we obtain the approximate value of the integral to six decimal places.

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Ifn=470 and p (p-hat) =0.53, find the margin of error at a 90% confidence level Give your answer to three decimals

Given that n = 470 and p (p-hat) = 0.53 and we are required to find the margin of error at a 90% confidence level.

First, we find the value of z from the standard normal distribution table that corresponds to a 90% confidence level, which is the complement of the significance level α = 1 - 0.90 = 0.10. Then, we use the formula for the **margin of error **that involves zα/2, p-hat and q-hat.

As per the formula:

Margin of error = zα/2 [sqrt(p-hat * q-hat)/n]

Here, p-hat = 0.53q-hat = 1 - p-hat = 1 - 0.53 = 0.47

n = 470So,

Margin of error = zα/2 [sqrt(p-hat * q-hat)/n] = z0.05 [sqrt(0.53 * 0.47)/470] = 0.048

We know that at a 90% **confidence level**, the value of zα/2 is 1.645

Hence, the answer is:

Margin of error = zα/2 [sqrt(p-hat * q-hat)/n] = z0.05 [sqrt(0.53 * 0.47)/470] = 0.048

The margin of error is 0.048, which means that the true population **proportion** is estimated to be within 0.048 of the sample proportion with 90% confidence. Now, we can construct the confidence **interval** as:

p-hat ± Margin of error = 0.53 ± 0.048

The lower limit is 0.53 - 0.048 = 0.482

The upper limit is 0.53 + 0.048 = 0.578

Hence, we can conclude that the true population proportion is estimated to be between 0.482 and 0.578 with 90% confidence. Therefore, the conclusion is that the confidence interval for the population proportion at a 90% confidence level is (**0.482, 0.578**).

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The number of welfare cases in a city of population p is expected to be 0.00%) the population is growing by 900 people per year, find the rate at which the number of welfare cases will be increasing when the population is p= 1,000,000. ______ cases per yr

When the population of the city is 1,000,000 and growing at a **rate** of 900 people per year, the number of welfare cases is expected to increase by **approximately** 3,690 cases per year.

To find the rate at which the number of welfare cases will be increasing, we need to consider the growth rate of the population and the percentage of welfare cases.

Given that the expected number of welfare cases is 0.00% of the population, we can assume that the number of welfare cases is directly proportional to the population.

Let's denote the number of welfare cases as C and the population as P. We can express the **relationship** as C = k .P, where k is a constant. Since the expected number of welfare cases is 0.00%, we can substitute C = 0.00% of P, or C = 0.0000. P.

Now, we can calculate the derivative of C with respect to time t to find the rate of change:

dC/dt = d/dt (0.0000. P)

Since P is growing at a rate of 900 people per year, we can express it as dP/dt = 900. Substituting this into the **derivative** equation:

dC/dt = d/dt (0.0000. P)

= 0.0000. dP/dt

= 0.0000. 900

= 0

Therefore, the rate at which the number of welfare cases is **increasing **when the population is 1,000,000 and growing at a rate of 900 people per year is 0 cases per year. This means that the number of welfare cases remains **constant**, assuming the expected percentage of 0.00% holds true.

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The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,495 hours. The population standard deviation is 92 hours. A random sample of 64 light bulbs indicates a sample mean life of 7,472 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7.495 hours? b. Construct a 95% confidence interval estimate of the population mean life of the light bulbs. c. Compare the results of (a) and (c). What conclusions do you reach?

The **null hypothesis** is rejected, and the confidence interval does not include 7,495 hours. We conclude that the **mean life **of the CFLs is different from 7,495 hours.

a. At the 0.05 **level of significance**, we reject the null hypothesis and conclude that the mean life of the **CFLs **is different from 7,495 hours.

b. The 95% confidence interval for the **population mean** life of the light bulbs is 7,429.8 to 7,494.2 hours.

c. The results of (a) and (c) are consistent. The **confidence interval** does not include 7,495 hours, which supports the conclusion that the mean life of the CFLs is different from 7,495 hours.

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Question 3 Quantity Price 5 $10 10 $9 16 $8 23 $7 31 $6 45 $5 52 $4 60 $3 This monopolist has fixed costs of $40 and constant marginal cost of $5. What is the marginal revenue if they produce 10 units? [Select] What is this monopolist's profit if they were to produce 45 units? [Select] What is the monopolist's profit-maximizing price to charge? [Select] What is the average total cost of production for this monopolist if they produce 16 units? [Select] 4 pts
What is the effect of adding the government secto to the economy onthe GDP and AE?PLS HELP 30 MINS LEFT
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A company erroneously recorded cash purchases in thedepreciation expense account when it was purchased. The financialstatement impact of the error in the year of acquisition wouldbe:Multiple Choic
International Marketing Incident B: Latin America Debt Crisis In the early 1980s a major debt crisis was widespread throughout Latin America. From the biggest to the smallest economies, countries' foreign debt exceeded their earning power. During this "lost decade" many countries were unable to meet their debt obligations, causing per capita income to drop. Further, poverty levels rose as the gap between the wealthy and poor increased dramatically. The economic and social consequences from the Latin America debt crisis as a whole included the following: Devaluation of currencies, stock markets and asset prices Nominal US dollar GDP of Latin American countries fell drastically Businesses collapsed leading to millions of people falling below the poverty line Intervention of the IMF (International Monetary Fund) for loans and fiscal planning Negative public sentiment that their countries were being controlled by outsiders What if your company had a plant in Mexico that was serving the local Mexican market? Because of the crisis the following changes in demand for Economy SKUs occurred in Mexico: 20% decrease in demand for Large 10% decrease in demand for Medium 10% increase in demand for Small Specifically as Mexican demand changed, how would this affect your Gross Margins (MXN) in Mexico if you had the following Economy SKUS? Assume per unit costs and prices remain the same. 5 n 27.1 SKU Contribution Mexico Frgt/Trf GrossMargi SKU Units Rev. Allow. COGS GrossMargin % Ecnm/Med/Tube/Pst 3.7 63.2 5.0 30.2 0.9 42.9% Ecnm/Sm/Tube/Gel 2.9 57.3 4.6 27.9 0.7 241 42.1% Ecnm/Med/Tube/Gel 3.3 37.5 2.5 22.9 08 113 30.1% Ecnm/Lg/Tube/Gel 16.7 275.3 18.7 139.1 40 113.5 41.2% Total 26.6 433.3 30.8 6.4 176.0 40.6% Units in millions, other amounts shown in millions of MXN. 220.1 Specifically as Mexican demand changed, how would this affect your Gross Margins (MXN) in Mexico if you had the following Economy SKUs? Assume per unit costs and prices remain the same. dramatically. The economic and social consequences from the Latin America debt crisis as a whole included the following: Devaluation of currencies, stock markets and asset prices Nominal US dollar GDP of Latin American countries fell drastically Businesses collapsed leading to millions of people falling below the poverty line Intervention of the IMF (International Monetary Fund) for loans and fiscal planning Negative public sentiment that their countries were being controlled by outsiders Negative public sentiment that their countries were being controlled by outsiders What if your company had a plant in Mexico that was serving the local Mexican market? Because of the crisis the following changes in demand for Economy SKUs occurred in Mexico: 20% decrease in demand for Large 10% decrease in demand for Medium 10% increase in demand for Small
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the centers and radii of the spheres in Exercises 55-58. 55. x + y + z + 4x - 4z = 0 (a-b) =a_ab +6 - 56. x + y + z + 8z = 0 57. 2x + 2y + 2z + x + y + z = 9 58. 3x + 3y + 3z + 2y - 2z = 9
The base of a right triangle is increasing at a rate of 1 meter per day and the height is increasing at a rate of 2 meters per day. When the base is 9 meters and the height is 20 meters, then how fast is the HYPOTENUSE changing? The rate of change of the HYPOTENUSE is____ meters per day. (Enter your answer as a integer or as a decimal number rounded to 2 places.)
6. Shawn (280 lbs) runs stairs for 45 minutes at a rate of 15 METs. What is his total caloric expenditure in kcals? 7. Sheryl (114 lbs) rode her motor scooter for 20 minutes to get to class (MET= 2.5). What was her total caloric expenditure for this activity?
As the United States continues to further develop,industrialization propels the nation forward. Discuss howindustrial change and urbanization starts to form parts of theUnited States.
find ff,netff,net , the magnitude of the net force acting on the cyclist at the finish line. express your answer in newtons to two significant figures.
5. (15 points) A sample of 20 students who have taken a statistics exam at Ik University, shows a mean = 72 and variance s = 16 at the exam grades. Assume that grades are distributed normally, find a %98 confidence interval for the variance of all student's grades.
Analyze the search engine optimization technique and what it is designed for. (Support all your answers with more research and examples.) digital business related question
2. [-15 Points] DETAILS Find the cylindrical coordinate expression for F(x, y, z). F(x, y, z) = 6ze*2 + y2 + 22