Mariah's lunch bill was $13.00. What is the least amount
of bills she could use to pay for her lunch?

The values of a and n that make the equation[tex](ax^6)^(1/n) = 4x^2[/tex] true for all values of x are a = 4 and n = 3.

The laws of exponents are rules for simplifying expressions with powers, including multiplying powers with the same base, dividing powers with the same base, and raising powers to a power.

The equation is [tex](ax^6)^(1/n) = 4x^2[/tex]. We want to find the values of a and n that make this equation true for all values of x.

We can begin by simplifying the equation using the laws of exponents:

[tex](ax^6)^(1/n) = 4x^2[/tex]

a[tex]ax^6/n = 4x^2[/tex]

Now we can solve for a and n by comparing the exponents of x on both sides of the equation:

The exponent of x on the left side is 6/n, and the exponent of x on the right side is 2. Therefore:

[tex]6/n = 2[/tex]

Multiplying both sides by n, we get:

6 = 2n

Dividing both sides by 2, we get:

n = 3

Now we can solve for a by substituting n = 3 into the equation and simplifying:

[tex]ax^6/3 = 4x^2\\ax^2 = 4x^2[/tex]

a = 4

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Step-by-step explanation:

a) Domain of both functions is all real numbers (-∞, +∞), as there are no restrictions on the input (x).

b) The range of A) f(x)=x² /3 is [0, +∞), as the minimum value of the function is 0 and there is no maximum value.

The range of B) f(x) = -3x² is (-∞, 0], as the maximum value of the function is 0 and there is no minimum value.

c) The vertex of A) f(x)=x² /3 is at (0,0).

The vertex of B) f(x) = -3x² is at (0,0).

d) The axis of symmetry of both functions is the vertical line passing through the vertex, which is x = 0.

e) The minimum value of A) f(x)=x² /3 is 0, which occurs at the vertex.

f) The maximum value of B) f(x) = -3x² is 0, which occurs at the vertex.

g) A) f(x)=x² /3 is a horizontally shrunk version of the parent function f(x) = x² by a factor of 1/3.

B) f(x) = -3x² is a vertically stretched version of the parent function f(x) = x² by a factor of 3.

h) A) f(x)=x² /3 opens upward, as the coefficient of x² is positive.

B) f(x) = -3x² opens downward, as the coefficient of x² is negative.

Therefore, the equations that have the same solution as 2.3p – 10.1 = 6.5p – 4 – 0.01p are: 2.3p – 10.1 = 6.4p – 4 and 23p – 101 = 65p – 40 – p.

In mathematics, an equation is a statement that two expressions are equal. It typically contains one or more variables (unknowns) and specifies a relationship between those variables. Equations are used to model real-world phenomena, solve problems, and make predictions. There are many types of equations in mathematics, including linear equations, quadratic equations, polynomial equations, exponential equations, trigonometric equations, and many more. Each type of equation has its own set of methods and techniques for solving it.

Here,

To rewrite the given equation using properties, we can simplify both sides by combining like terms and then isolate the variable term on one side of the equation:

2.3p – 10.1 = 6.5p – 4 – 0.01p

2.3p - 6.5p + 0.01p = -4 + 10.1

-4.19p = 6.1

p = -6.1/4.19

To check which equations have the same solution, we can substitute this value of p into each equation and see if both sides are equal:

2.3p – 10.1 = 6.4p – 4

2.3(-6.1/4.19) - 10.1 = 6.4(-6.1/4.19) - 4

-9.84 = -9.84

This equation has the same solution as the original equation.

23p – 101 = 65p – 40 – p

23(-6.1/4.19) - 101 = 65(-6.1/4.19) - (-6.1/4.19)

-63.64 = -63.64

This equation also has the same solution as the original equation.

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Answer:

[tex](a+b)^2(a^2-ab+b^2)[/tex]

To find the length of the hypotenuse in a right-angled triangle, we can use trigonometry. Using the given values of RS and angle Q, we can solve for QS ≈ 24.08 cm to the nearest hundredths place.

To find the length of the hypotenuse in a right-angled triangle with a given angle and one side, we can use trigonometry. In this case, we are given the angle Q, which is 65°, and the length of one of the sides, RS, which is 22 cm. We can use the sine function to relate the opposite side, RS, to the hypotenuse, QS. Solving for QS gives us QS = RS / sin(65°), which we can then evaluate to find QS ≈ 24.08 cm. Therefore, x ≈ 24.08 cm to the nearest hundredths place.

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The missing figure is in the image attached below

The slope of the least-squares regression line is 0.50, which means that for each additional pound in weight, the child's height is expected to increase by 0.5 inches.

The slope of the least-squares regression line can be calculated using the formula:

Slope = (Σxy – (Σx)(Σy)/n) / (Σx2 – (Σx)2/n)

Where n is the number of data points, Σx is the sum of all x-values, Σy is the sum of all y-values, and Σxy is the sum of the products of the x-values and the y-values.

For example, consider a dataset with 10 data points, where the x-values are the heights in inches, and the y-values are the weights in pounds. The sum of the x-values, Σx, would be the total height of all 10 children, the sum of the y-values, Σy, would be the total weight of all 10 children, and the sum of the products of the x-values and y-values, Σxy, would be the total of the products of the heights and the weights for all 10 children. Using these values, the slope of the least-squares regression line would be:

Slope = (Σxy – (Σx)(Σy)/n) / (Σx2 – (Σx)2/n)

      = (2098 - (2040)(812)/10) / (4246 - (2040)2/10)

      = (98) / (1406)

      = 0.50

Therefore, the slope of the least-squares regression line is 0.50, which means for each additional pound in weight, the child's height is predicted to increase by 0.5 inches.

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Answer:

Step-by-step explanation:Sure! To find the value of P(3) for the polynomial rule P(x) = 5x^2, we just need to substitute x = 3 into the rule and simplify:

P(3) = 5(3^2) (Substitute x = 3)

= 5(9) (Evaluate 3^2)

= 45 (Multiply 5 by 9)

Therefore, P(3) = 45 when P(x) = 5x^2.

Answer:

x=3125

Step-by-step explanation:

5×5×5×5×5=5x

15625=5x

divide by 5 both sides

[tex] \frac{15625}{5} [/tex]

x=3125

Answer:

3125

Step-by-step explanation:

[tex]5 \times 5 \times 5 \times 5 \times 5 \times 5 = 5x \\ {5}^{6} = 5x \\ \frac{ {5}^{6} }{5} = x \\ \frac{15625}{5} = x \\ x = 3125[/tex]

The maximum number of intersection points between 5 circles on a plane is 20.

To see why, we can use a formula that calculates the maximum number of intersection points between n circles on a plane. This formula is:

N = n(n-1)/2

For n=5, we have:

N = 5(5-1)/2

N = 5(4)/2

N = 10

So there are a total of 10 intersection points between the 5 circles. However, we have to remember that not all of these intersection points may be distinct. For example, three circles intersecting at the same point will count as three intersections, but only as one distinct intersection point.

Therefore, we need to count how many of these 10 intersection points are distinct. With a bit of visualization, we can see that each circle can intersect with the other four circles in two different points, for a total of 8 distinct intersection points per circle. Since we have 5 circles, we multiply 8 by 5 to get:

8 x 5 = 40

However, we have overcounted, since any intersection point shared by three circles counts as three, but only as one distinct intersection point. There are exactly 10 such triple intersections, as we can see by drawing the five circles such that each circle intersects with the other two. So we need to subtract 20 (since each of the 10 triple intersections counts as 3, not 1).

Therefore, the maximum number of distinct intersection points between 5 circles on a plane is:

40 - 20 = 20

So the answer is 20.

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To get to 200 feet, the car will need to do 27 complete rotations, rounded to the nearest whole number.

The circumference of the wheel, which is determined by: is equal to the distance covered by the vehicle during one rotation of the wheels.

C = πd

where d represents the wheel's diameter. Using the approximate value of as 3.14 and the supplied value of d = 28 inches, we get:

C=3.1428 = 87.92 inches

The vehicle covers 87.92 inches in a single revolution.

As there are 12 inches in a foot, we divide this measurement by 12 to convert it to feet:

12.5"/foot divided by 87.92" equals 7.3267"/revolution (rounded to 4 decimal places)

Hence, one tyre rotation of the vehicle will result in a distance of 7.3267 feet.

The automobile must execute the following moves to move 200 feet:

200 feet multiplied by 7.3267 feet per revolution results in 27.296 revolutions.

To get to 200 feet, the car will need to do 27 complete rotations, rounded to the nearest whole number.

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(i). The required probability is approximately 0.486 or 48.6%.

(ii) The required probability is approximately 0.536 or 53.6%.

(iii) The required probability is approximately 0.329 or 32.9%.

Given:

Total employees (n) = 700

Employees with a life insurance policy (A) = 340

Employees with a medical insurance cover (B) = 280

Employees who participate in both programs (A ∩ B) = 150

i) To find the probability that a randomly selected employee will be a participant in at least one of the two programs (A or B), we need to calculate P(A ∪ B).

Using the inclusion-exclusion principle:

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

P(A ∪ B) = (340/700) + (280/700) - (150/700)

P(A ∪ B) = 0.671

Therefore, the probability that a randomly selected employee will be a participant in at least one of the two programs is approximately 0.486 or 48.6%.

ii) To determine the probability that an employee will be a participant in the life insurance plan given that he/she has medical insurance coverage, we need to find P(A | B).

Using the formula for conditional probability:

P(A | B) = P(A ∩ B) / P(B)

P(A | B) = (150/700) / (280/700)

P(A | B) = 0.536

Therefore, the probability that an employee will be a participant in the life insurance plan given that he/she has medical insurance coverage is approximately 0.536 or 53.6%.

iii) To determine the probability that one has none of the two insurance covers, we need to find the complement of P(A ∪ B), which is the probability of not being a participant in either program.

P(neither A nor B) = 1 - P(A ∪ B)

P(neither A nor B) = 1 - 0.671

P(neither A nor B) = 0.329

Therefore, the probability that an employee has none of the two insurance covers is approximately 0.329 or 32.9%.

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The evaluation of the questions in the parts using substitution method, can be presented as follows;

9. First part; The mistake is the assumption that there are no solution; The equation have an infinite number of solutions

Second part; The main difference between solving a system of equations by graphing and solving by substitution is that graphing involves visualizing the equations, while substitution involves algebraic manipulation.

Solving by graphing can be useful to find a quick estimate of the solution of the equation system, while substitution is useful for finding the exact solution to the equations.

Third part; The dimensions are;

Length, L = 11.8 feet

Width, W = 7.2 feet

Fourth part; Zaid made 4 two-points basket, and 3 three-point baskets in the game.

The substitution method used for solving a system of equations involves solving one of the equations for one of the variables, and then substituting the expressions obtained into the other equation.

First part;

The first problem can be expressed as follows;

x + y = 7

2·x + 3·y = 17

The substitution method can be used to find the solution to the above system of equations as follows;

x = 7 - y

The above expression for the variable x can be substituted in the second equation as follows;

2·(7 - y) + 3·y = 17

Therefore; 14 - 2·y + 3·y = 17

The combination like terms, indicates;

y = 17 - 14 = 3

y = 3

Therefore; x + 3 = 7

x = 7 - 3 = 4

x = 4

Therefore, Zaid made 4 two-point baskets and 3 three-point baskets in the game

Therefore, the number of two-point basket Zaid made are 4, and the number of three-point basket he made in the game are 3

Second part;

The system of equations in the situation is presented as follows;

L = W + 4.6

2·L + 2·W = 38

The substitution of the variables can be used to solve the system of equations as follows;

2·(W + 4.6) + 2·W = 38

Simplifying the above equation, we get;

4·W + 9.2 = 38

Therefore; W = (38 - 9.2)/4 = 28.8/4 = 7.2

W = 7.2

Substituting the value of W in the above equation for L, we get;

L = 7.2 + 4.6 = 11.8

L = 11.8

The dimensions of the rectangle are therefore;

Length, L = 11.8 feet

Width, W = 7.2 feet

Third Part;

Solving a system of equations by graphing involves graphing the equations on the same coordinate plane and finding the point of intersection of the two lines. The point of intersection represents the solution to the system of equations.

Solving a system of equations by substitution involves solving one of the equations for one of the variables in terms of the variable, and then substituting this expression into the other equation. This results in an equation with only one variable, which can be solved to find the value of the variable. Once one variable is found, the other variable can be found by substituting the value of the value of the first variable into one of the original equations.

Fourth part;

The equations; y = x - 1, and y - x = -1 are the same equation, therefore, the equations have infinite number of solutions

Therefore;

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Answer: The correct answer is:

The equation ý = -7.61 +0.19x is called the least-squares regression line because it minimizes the sum of the squared residuals.

Explanation:

The least-squares regression line is a line that represents the best linear approximation of the relationship between two variables. It is called "least-squares" because it minimizes the sum of the squared residuals, which are the differences between the observed values and the predicted values from the regression line.

In this case, the scatterplot shows the relationship between arm span and foot length for 19 students in a statistics class. The equation ý = -7.61 +0.19x is the equation of the least-squares regression line for this data set. This means that it is the line that best fits the data by minimizing the sum of the squared residuals.

Therefore, the correct answer is that the equation ý = -7.61 +0.19x is called the least-squares regression line because it minimizes the sum of the squared residuals.

Step-by-step explanation:

The root of the equation is rational for any real value of a where a>0. if a=0, the equation has a single root which is real and rational.

In mathematics, the number that results in the initial number when multiplied by itself is called the root. For instance, 7 is the square root of 49 since 77=49. Because 49 is created by multiplying 7 by itself twice in this instance, we refer to 7 as the square root of 49. Since 333=27, the cube root of 27 is 3.

The given equation is 2x + a(x-a) = 0. Simplifying, we get:

[tex]$\begin{align*}2x + ax - a^2 &= 0 \x(2+a) &= a^2 \x &= \frac{a^2}{2+a}\end{align*}[/tex]

Therefore, the root of the equation is [tex]\frac{a^2}{2+a}$[/tex].

To show that this root is rational for any real value of a where a>0, we need to show that [tex]\frac{a^2}{2+a}$[/tex] can be expressed as a ratio of two integers.

Let [tex]$p=a^2$[/tex] and q=2+a. Since a>0, we have p>0 and q>0. Therefore, [tex]\frac{p}{q}$[/tex] is a rational number.

Thus, the root of the equation is rational for any real value of a where a>0.

If a=0, the given equation becomes 2x=0, which has only one root, x=0. Therefore, if a=0, the equation has a single root which is real and rational.

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The explicit formula of each arithmetic sequence is given as follows:

An arithmetic sequence is a sequence of values in which the difference between consecutive terms is constant and is called common difference d.

The nth term of an arithmetic sequence is given by the explicit formula presented as follows:

[tex]a_n = a_1 + (n - 1)d[/tex]

[tex]a_1[/tex] is the first term of the arithmetic sequence.

For each sequence in this problem, the first term and the common difference are obtained, then substituted into the equation, which is simplified.

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Answer:

x=5

Step-by-step explanation:

when to solve an equation which was given as 2x=10 then you have to make x the subject so you will divide 10 by the coefficient of x by 2x=10 then you will get your answer to be 5 as simple as that

The size of the union of sets is determined using the Principle of Inclusion-Exclusion (PIE).

What is inclusion-exclusion principle?

The inclusion-exclusion principle is a counting method that generalises the well-known approach to determining the number of members in the union of two finite sets in the field of combinatorics.

The Principle of Inclusion-Exclusion (PIE) is a counting technique used to find the size of a union of sets.

It is often used when counting the number of elements that belong to one or more sets.

For a simple example, consider two sets A and B.

The size of their union (i.e., the number of elements that belong to A or B, or both) can be found using the formula -

|A ∪ B| = |A| + |B| - |A ∩ B|

Here, |A| represents the size of set A, |B| represents the size of set B, and |A ∩ B| represents the size of the intersection of A and B (i.e., the number of elements that belong to both A and B).

The formula says that to find the size of the union of A and B, we add the sizes of A and B, but then we need to subtract the size of the intersection of A and B, because we have counted those elements twice.

The Principle of Inclusion-Exclusion can be extended to n different sets, as follows -

|A₁ ∪ A₂ ∪ ... ∪ Aₙ| = ∑|Aᵢ| - ∑|Aᵢ ∩ Aⱼ| + ∑|Aᵢ ∩ Aⱼ ∩ Aₖ| - ... + (-1)ⁿ₋¹|A₁ ∩ A₂ ∩ ... ∩ Aₙ|

Here, the notation ∑ represents a sum, and the notation (-1)ⁿ₋¹ represents (-1) to the power of n-1.

The formula says that to find the size of the union of n different sets, we add up the sizes of all the individual sets, then subtract the sizes of all possible intersections of two sets, then add the sizes of all possible intersections of three sets, and so on, alternating between addition and subtraction, until we add or subtract the size of the intersection of all n sets, depending on whether n is even or odd.

Therefore, the PIE is defined and described for n different sets.

This formula can be used to count the number of elements in the union of any number of sets, but it can get quite complex for large values of n.

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a) The percentage of females in the workforce in the year 2013 and 2018 can be found using the given equation: y = 11.596 + 8.540 ln(x), where x is the number of years from 1960. We need to find the value of y when x is 53 (2013) and 58 (2018), as we know that 1970 was 10 years after 1960.

So, when x = 53 (in the year 2013), the percentage of females in the workforce can be found as: y = 11.596 + 8.540 ln(53)

= 11.596 + 8.540 × 3.970

= 11.596 + 33.8618

= 45.4578 %

Therefore, the model predicts that the percentage of females in the workforce was 45.4578% in 2013.

Similarly, when x = 58 (in the year 2018), the percentage of females in the workforce can be found as:

y = 11.596 + 8.540 ln(58)

= 11.596 + 8.540 × 4.060

= 11.596 + 34.7244

= 46.3204 %

Therefore, the model predicts that the percentage of females in the workforce was 46.3204% in 2018.

b) To determine if the percentage of female workers is increasing or decreasing, we need to look at the coefficient of ln(x) in the given equation. Here, the coefficient of ln(x) is positive (8.540). Hence, the percentage of female workers is increasing over the years.

Therefore, the percentage of female workers is increasing.

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A current account is typically ideal to perform day-to-day transactions such as receiving a salary, paying bills, and making purchases.

A current account (or checking account) is an account that, unlike a savings account does not pay interest on the balance. In most cases rather fees may be charged from the available balance, such as overdrafts or international transactions.

It would be ideal to use a current account to perform day-to-day transactions such as receiving as a salary account, to pay for bills, and for making purchases.

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You've asked an incomplete question. However, I assumed you need more information about a current account, thus, they're provided above.

Answer:

Step-by-step explanation:

Answer: 27.5

Step-by-step explanation:

Hope this helps

The total price of 15 blouses whilst every shirt costs GH¢ 2.50 is GH¢ 37.50.

To calculate the overall price of 15 blouses at a price of GH¢ 2.50 per blouse, you can use multiplication. Multiplying the cost of 1 blouse (GH¢ 2.50) with the aid of the number of blouses (15) offers you the total value of 15 blouses.

Using this approach, the total cost of 15 blouses could be:

Total price of 15 blouses = 15 x GH¢ 2.50 = GH¢ 37.50

Therefore, the full price of 15 blouses whilst every shirt costs GH¢ 2.50 is GH¢ 37.50. This calculation is critical in commercial enterprise and retail settings while figuring out the total price of a buy or order.

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The terms denοminatοr and numeratοr are nοt directly related tο a mοdel unless the mοdel invοlves a fractiοn οr a ratiο.

The denοminatοr and numeratοr are terms οften used in mathematics and fractiοns. In a fractiοn, the numeratοr is the tοp number, and the denοminatοr is the bοttοm number. The numeratοr represents the number οf parts being cοnsidered οr cοunted, while the denοminatοr represents the tοtal number οf parts in the whοle.

The terms denοminatοr and numeratοr are nοt directly related tο a mοdel unless the mοdel invοlves a fractiοn οr a ratiο.

Hοwever, in statistical mοdels, the dependent and independent variables can be thοught οf as the numeratοr and denοminatοr οf a ratiο οr a fractiοn. The dependent variable represents the numeratοr, the number οf events οr οbservatiοns οf interest, while the independent variable represents the denοminatοr, the tοtal number οf events οr οbservatiοns.

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Number of people with AB+ blood type = 3.4 / 100 x 300 .Number of people with AB+ blood type = 10.Therefore, of the 300 people who donated blood, approximately 10 people would have been AB+.

Assuming the distribution of blood types in Springfield are the same as the distribution in the US, then the percent of AB+ blood type donors would be 3.4%. Therefore, of the 300 people who donated blood, approximately 10 people would have been AB+. This calculation is based on the following formula: Percent of AB+ blood type donors = Number of people with AB+ blood type / Total number of people who donated Number of people with AB+ blood type = Percent of AB+ blood type donors / 100 x Total number of people who donated Number of people with AB+ blood type = 3.4 / 100 x 300 .Number of people with AB+ blood type = 10.

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Step-by-step explanation:

First one

5,5√5,25

Second one

-3,12,-48

The linear model, based on the residual plot shown and the data from the 12 students is appropriate because D. Yes, about half of the residuals are positive and half are negative.

When analyzing a residual plot, an appropriate linear model should display the following characteristics:

Looking at the residual plot for the hours spent by students doing homework and their performance on exams, we can see that the residuals are scattered randomly, there is no apparent pattern and the number of residuals above and below the line are roughly equal.

The linear model is therefore best.

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To calculate the minimum sample size required to construct a 90% confidence interval with a maximum error of 0.06 pounds, we can use the formula:

n = (Z^2 * σ^2) / E^2

where n is the sample size, Z is the z-score corresponding to the desired confidence level (in this case, 90%), σ^2 is the variance, and E is the maximum error.

Substituting the given values, we get:

n = (1.645^2 * 1.44) / 0.06^2

n = 84.934

Rounding up to the next integer, we get a minimum sample size of 85 people over age 49.

Therefore, the marketing research company must include at least 85 people over age 49 in their sample to construct a 90% confidence interval with a maximum error of 0.06 pounds, assuming a variance of 1.44 pounds and a mean consumption of meat per week of 4.2 pounds.

A new graph is produced from parent function, which is horizontally moved 6 units to the left, extended vertically, and shifted 2 units downward.

By performing numerous transformations, including shifts, stretches, and reflections, a parent function is a fundamental function that serves as the foundation for the creation of subsequent functions. Since they have straightforward, well-known qualities and are simple to alter to produce new functions, parent functions are frequently used. Linear, quadratic, cubic, square-root, absolute value, and exponential functions are a few examples of typical parent functions. Each parent function has a unique structure and set of characteristics that may be used to forecast how the function will behave after being changed.

The following procedures can be used to change the graph of the square root parent function, f(x) = x, to produce g(x) = 2 (x + 6) - 2.

Shift to the left by 6 units along the horizontal axis: The square root function's expression (x + 6) causes this shift.

Stretching the graph vertically is accomplished by multiplying the square root function by a factor of two.

Vertical shift: Next, a 2-unit downward shift is applied to the entire function.

A new graph is produced as a result of these modifications, which is horizontally moved 6 units to the left, extended vertically, and shifted 2 units downward.

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The inverse relation of the function f(x)=−72x+4 is f⁻¹(x) = 4 - y / 72.

A function takes in values, applies specific operations to them, and produces an output. The inverse function acts, agrees with the outcome, and returns to the initial function. The graph of the inverse of a function shows the function and the inverse of the function, which are both plotted on the line y = x. This graph's line traverses the origin and has a slope value of 1.

The given function is:

f(x)=−72x+4

Substitute the value of f(x) = y:

y = -72x + 4

Isolate the value of x:

y - 4 = -72x

x = 4 - y / 72

Now, let the value of x be written as f⁻¹(x), thus:

f⁻¹(x) = 4 - y / 72

Hence, the inverse relation of the function f(x)=−72x+4 is f⁻¹(x) = 4 - y / 72.

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Answer:

The correct answer is

Using the Empirical Rule, Lillian should score between 119 and 141 in 68% of the games she bowls.

In statistics, the 68–95–99.7 rule, also known as the empirical rule, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively. the empirical rule states that 99.7% of data occurs within three standard deviations of the mean within a normal distribution. To this end, 68% of the observed data will occur within the first standard deviation, 95% will take place in the second deviation, and 97.5% within the third standard deviation. The empirical rule predicts the probability distribution for a set of outcomes.

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Using permutation and combination concept, there are 358,800 different passwords that are possible and the number of more passwords available through this combination is 1054920

(a) To find the number of different passwords that are possible, we can use the permutation formula. Since there are 26 letters in the alphabet and we are choosing 4 letters without repetition, we can write:

Number of possible passwords = P(26, 4)

= 26 x 25 x 24 x 23

= 358,800

Therefore, there are 358,800 different passwords that are possible.

(b) If the numbers 1 through 10 are also available to be chosen only once in addition to the alphabet, we can use the same permutation formula to find the number of different passwords that are possible. Since there are now 36 characters to choose from (26 letters + 10 numbers), and we are choosing 4 characters without repetition, we can write:

Number of possible passwords = P(36, 4)

P(36, 4) - P(26, 4) = 1054920

The number of more passwords available through this combination is 1054920

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