What is the value of x ?


A. 120 B. 135 C. 145 D. 160

Answers

Answer 1

The value of x is 130 (option b).

As per the given Exterior angles of a triangle,

A linear pair of angles adds up to 180°.

The interior angle of 120° is calculated as 180° - 120° = 60°.

Similarly, the interior angle of 110° is found by subtracting it from 180°: 180° - 110° = 70°.

The exterior angle of a triangle is equal to the sum of the opposite two interior angles.

Hence, we can calculate x as follows:

x = 60° + 70°

x = 130°

Therefore, the value of x is 130°.

Hence the correct option is (b).

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Complete Question:

What is the value of x ?

A. 120 B. 130 C. 145 D. 160

What Is The Value Of X ? A. 120 B. 135 C. 145 D. 160

Related Questions

You are given a 1.41-g mixture of sodium nitrate and sodium chloride. You dissolve this mixture into 135 mL of water then add an excess of 0.542 M silver nitrate solution. You produce a white solid, which you then collect, dry, and measure. The white solid has a mass of 1.464 g.

a. If you had an extremely magnified view of the solution (to the atomic-molecular level), list the species you would see (include charges, if any).

b. Write the balanced net ionic equation for the reaction that produces the solid. Include phases and charges.

c. Calculate the percent sodium chloride in the original unknown mixture.

Answers

a. If we had an extremely magnified view of the solution, to the atomic-molecular level, the following species would be observed (including charges, if any) :2 Na+, NO3-, Ag+, and Cl-.b. The balanced net ionic equation for the reaction that produces the solid is: Ag+ + Cl- → AgCl↓c. Calculate the percent sodium chloride in the original unknown mixture:

1. Calculate the amount of AgCl precipitated. According to the balanced chemical reaction, 1 mol of AgNO3 reacts with 1 mol of NaCl to produce 1 mol of AgCl. A 0.542 M AgNO3 solution contains 0.542 mol/L of AgNO3.0.542 mol/L × 0.135 L = 0.07317 mol AgNO3 reacted with NaCl.0.07317 mol AgNO3 × (1 mol NaCl / 1 mol AgNO3)

= 0.07317 mol NaCl precipitated.2. Calculate the number of moles of NaCl and NaNO3 in the original sample.Mass of sample = 1.41 gMass of AgCl produced = 1.464 g Subtracting the mass of AgCl from the mass of the sample gives us the mass of NaCl and NaNO3 in the original sample:

Mass of NaCl and NaNO3 = 1.464 g − 1.41 g = 0.054 g.The percent of NaCl in the sample is given by: Mass of NaCl in the sample / Mass of the sample × 100 %= 0.067 g / 1.41 g × 100 %= 4.7%.Therefore, the percent of NaCl in the original mixture is 4.7%.

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a rectangle has area 81 m2. express the perimeter of the rectangle as a function of the length l of one of its sides.

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Let l be the length of the rectangle and w be the width of the rectangle. Therefore, the area of the rectangle is given by the formula:

We know that the area of the rectangle is given as 81m².

So, 81 = lw

Let's solve for w: w = 81/l

The perimeter of the rectangle is given by the formula: Perimeter of Rectangle = 2(Length + Width)P

= 2(l + w)

Substituting the value of w from the above equation: P = 2(l + 81/l) This is the required expression to calculate the perimeter of the rectangle in terms of length. In order to find the perimeter of a rectangle, we need to know the length and width of the rectangle. We can then use the formula for the perimeter of a rectangle, P = 2(l + w), and substitute the value of w that we just found: P = 2(l + 81/l) This is the required expression to calculate the perimeter of the rectangle in terms of length l.

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Complete the following items. For multiple choice items, write the letter of the correct response on your paper. For all other items, show or explain your work.How many distinct real roots does the equation x⁴+3x³-4 x=0 have?

a. 1

b. 2

c. 3

d. 4

Answers

The, combining the root x = 0 from the first factor and the potential three distinct real roots from the cubic equation, we can conclude that the equation x⁴ + 3x³ - 4x = 0 has a total of 4 distinct real roots.

The correct answer is (d) 4.

To determine the number of distinct real roots of the equation x⁴ + 3x³ - 4x = 0, we need to examine the behavior and properties of the equation.

The given equation is a quartic equation (degree 4) in terms of x. A quartic equation can have a maximum of four distinct real roots. However, it is not necessary that all four roots are real.

In this case, we can attempt to factor the equation and analyze its roots. Factoring can help us determine the number of distinct real roots.

x⁴ + 3x³ - 4x = 0

We can factor out an x from each term:

x(x³ + 3x² - 4) = 0

Now, we have a product of two factors equal to zero. To satisfy this equation, either x = 0 or (x³ + 3x² - 4) = 0.

The first factor, x = 0, gives us one real root at x = 0.

To analyze the second factor, we can attempt to factor it further or use numerical methods to find its roots. However, it is evident that the equation (x³ + 3x² - 4) = 0 is a cubic equation (degree 3), and a cubic equation can have a maximum of three distinct real roots.

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Determine the number of cycles each sine function has in the interval from 0 to 2π. Find the amplitude and period of each function. y= sin5∅

Answers

The number of cycles in the interval from 0 to 2π is 5. The amplitude is 1, and the period is 2π/5.

To determine the number of cycles, amplitude, and period of the sine function y = sin(5∅) in the interval from 0 to 2π, we need to analyze the equation.

The number in front of the variable (∅) represents the frequency of the sine function. In this case, the frequency is 5, meaning the sine function will complete 5 cycles within the interval from 0 to 2π.

The amplitude of the sine function is always positive and represents the maximum distance from the midline of the graph to either the peak or the trough. Since the amplitude is not mentioned in the equation, we assume it to be 1.

The period of the sine function is the distance it takes to complete one full cycle. The period can be found using the formula T = 2π/frequency. Plugging in the values, we get T = 2π/5.

To summarize:
- The sine function y = sin(5∅) has 5 cycles in the interval from 0 to 2π.
- The amplitude of the function is 1.
- The period of the function is 2π/5.

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let m be the number of units to make and b be the number of units to buy. if it costs $2 to make a unit and $3 to buy a unit and 4000 units are needed, the objective function is min 4000 (m b) max 8000m 12000b min 2m 3b max 2m 3b

Answers

The objective function is "min 2m + 3b" which represents the cost of making m units and buying b units. To find the optimal solution, we need to minimize this cost. To begin, we are given that the total number of units needed is 4000. This implies that m + b = 4000.

Now, let's solve for m and b separately.
1. Solving for m:
We want to minimize the cost of making m units, which costs $2 per unit. Therefore, the cost of making m units is 2m dollars.
2. Solving for b:
We want to minimize the cost of buying b units, which costs $3 per unit. Therefore, the cost of buying b units is 3b dollars.

To summarize:
- The cost of making m units is 2m dollars.
- The cost of buying b units is 3b dollars.
- The total number of units needed is 4000, so m + b = 4000.

The objective function "min 2m + 3b" represents the total cost. We want to minimize this cost.

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Let f(x)=2 x+5 and g(x)=x²-3 x+2 . Perform each function operation, and then find the domain.

-2 g(x)+f(x)

Answers

The domain of the function -2g(x) + f(x) is all real numbers (-∞, +∞).

To perform the function operation -2g(x) + f(x), we first need to substitute the given functions into the expression:

-2g(x) + f(x) = -2(x² - 3x + 2) + (2x + 5)

Next, we simplify the expression:

-2(x² - 3x + 2) + (2x + 5) = -2x² + 6x - 4 + 2x + 5

Combining like terms:

-2x² + 8x + 1

The resulting function is -2x² + 8x + 1.

To determine the domain of the function, we need to consider any restrictions on the values of x that make the function undefined. Since the given functions f(x) = 2x + 5 and g(x) = x² - 3x + 2 are both polynomial functions, their domain is all real numbers.

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Lengths of time it takes for new light bulbs to burn out are an example of which type of data?

Answers

Lengths of time it takes for new light bulbs to burn out are an example of continuous numerical data type.

Quantitative information that can be measured precisely and that can take on any value within a range is known as continuous numerical data. Measurements of length, time, weight, temperature, and many other quantifiable physical qualities are examples of continuous numerical data.

Continuous numerical data can have any value as long as it falls within a specified range, and using mathematical operations like addition, subtraction, multiplication, and division, it is possible to compare and analyze the numbers.

Since it alludes to a continuous range of precise numerical values. The duration of time in this scenario is expressed in hours, minutes, or seconds and can have any value within a specific range, for example, 0.5 hours, 1.25 hours, 2.75 hours, and so on.

Numerical data types like float and decimal can be used to represent continuous numerical data.

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Evaluate the line integral, where C is the given curve. C xy2 ds, C is the right half of the circle x2 y2

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Evaluate the line integral ∫C xy^2 ds over the right half of the circle x^2 + y^2 = r^2 using appropriate parameterization and integration techniques.

To evaluate the line integral ∫C xy^2 ds, where C is the right half of the circle x^2 + y^2 = r^2, we need to parameterize the curve C and express ds in terms of the parameter.

The right half of the circle x^2 + y^2 = r^2 can be parameterized by x = rcos(t) and y = rsin(t), where t varies from 0 to π.

To find ds, we can use the arc length formula ds = sqrt(dx^2 + dy^2).

Differentiating x and y with respect to t, we have dx/dt = -rsin(t) and dy/dt = rcos(t).

Substituting these values into the arc length formula, we get ds = sqrt((-rsin(t))^2 + (rcos(t))^2) dt = sqrt(r^2) dt = r dt.

Now we can express the line integral in terms of the parameter t:

∫C xy^2 ds = ∫(0 to π) (rcos(t))(rsin(t))^2 (r dt).

Simplifying, we have ∫(0 to π) r^4cos(t)sin^2(t) dt.

This integral can be evaluated using appropriate trigonometric identities and integration techniques.

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the computer can do one calculation in 0.00000000 15 seconds in the function t parentheses in parentheses equals

Answers

The computer would take approximately 7,500 seconds to perform 5 billion calculations, assuming each calculation takes 0.0000000015 seconds.

To find out how long it would take the computer to do 5 billion calculations, we can substitute the value of n into the function t(n) = 0.0000000015n and calculate the result.

t(n) = 0.0000000015n

For n = 5 billion, we have:

t(5,000,000,000) = 0.0000000015 * 5,000,000,000

Calculating the result:

t(5,000,000,000) = 7,500

Therefore, it would take the computer approximately 7,500 seconds to perform 5 billion calculations, based on the given calculation time of 0.0000000015 seconds per calculation.

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--The given question is incomplete, the complete question is given below " Computing if a computer can do one calculation in 0.0000000015 second, then the function t(n) = 0.0000000015n gives the time required for the computer to do n calculations. how long would it take the computer to do 5 billion calculations?"--

Calculate all four second-order partial derivatives and check that . Assume the variables are restricted to a domain on which the function is defined.

Answers

The function is defined on the given domain, we need to make sure that all the partial derivatives are defined and continuous within the domain.

To calculate the four second-order partial derivatives, we need to differentiate the function twice with respect to each variable. Let's denote the function as f(x, y, z).

The four second-order partial derivatives are:
1. ∂²f/∂x²: Differentiate f with respect to x twice, while keeping y and z constant.
2. ∂²f/∂y²: Differentiate f with respect to y twice, while keeping x and z constant.
3. ∂²f/∂z²: Differentiate f with respect to z twice, while keeping x and y constant.
4. ∂²f/∂x∂y: Differentiate f with respect to x first, then differentiate the result with respect to y, while keeping z constant.

To check that the function is defined on the given domain, we need to make sure that all the partial derivatives are defined and continuous within the domain.

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Designing i*CATch: A Multipurpose, Education-Friendly Construction Kit for Physical and Wearable Computing

Answers

i*CATch is a versatile construction kit that facilitates physical and wearable computing. It is designed to be user-friendly and educational, making it suitable for various learning environments.

i*CATch is a construction kit specifically created for physical and wearable computing. Its design aims to make it multipurpose and suitable for educational purposes. The kit provides users with the tools and resources to create and experiment with different interactive projects. It offers a user-friendly interface and features that are accessible to individuals with varying skill levels.

i*CATch promotes hands-on learning and allows users to explore concepts such as programming, electronics, and design. The kit is designed with the intention of being used in educational environments, providing educators and students with an engaging and interactive way to learn about technology and its applications. Through the use of i*CATch, users can develop their creativity, problem-solving skills, and understanding of physical and wearable computing.

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the credit scores of 35-year-olds applying for a mortgage at ulysses mortgage associates are normally distributed with a mean of 600 and a standard deviation of 90. (a) find the credit score that defines the upper 5 percent.

Answers

The Z-score associated with the upper 5 percent is 1.645. The credit score that defines the upper 5 percent is approximately 748.05.

To find the credit score that defines the upper 5 percent, we can use the Z-score formula. The Z-score is calculated by subtracting the mean from the given value and dividing the result by the standard deviation.
In this case, we want to find the Z-score that corresponds to the upper 5 percent. The Z-score associated with the upper 5 percent is 1.645 (approximately).
To find the credit score that corresponds to this Z-score, we can use the formula:
Credit Score = (Z-score * Standard Deviation) + Mean
Substituting the values, we get:
Credit Score = (1.645 * 90) + 600
Credit Score = 148.05 + 600
Credit Score = 748.05
Therefore, the credit score that defines the upper 5 percent is approximately 748.05.

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Find each product.

0.8[20 15 ]right

Answers

The product of the given matrix with 0.8 is [16 12].

The given problem is quite simple and can be easily solved by multiplying each element of the matrix by 0.8.

Given matrix is [20 15].To find 0.8 times the given matrix, we will multiply each element of the matrix by 0.8.

The resulting matrix will have the same dimensions as the given matrix.

[0.8 * 20, 0.8 * 15] = [16, 12]

Therefore, the product of the given matrix with 0.8 is [16 12].

The given problem is quite simple and can be easily solved by multiplying each element of the matrix by 0.8. I hope you understand this.

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what does a multiple linear regression mean if its intercept is not statistically significant, but its slopes are

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If the intercept of a multiple linear regression is not statistically significant but the slopes are, it means that the relationship between the independent variables and the dependent variable starts from zero, and the slopes represent the change in the dependent variable for each unit change in the independent variables.

In multiple linear regression, the intercept represents the value of the dependent variable when all independent variables are zero. If the intercept is not statistically significant, it means that the relationship between the independent variables and the dependent variable does not start from a non-zero value. Instead, it starts from zero.

On the other hand, if the slopes are statistically significant, it means that there is a significant relationship between the independent variables and the dependent variable, and each unit change in the independent variables leads to a significant change in the dependent variable. The slopes represent the magnitude and direction of this change. Therefore, although the intercept is not significant, the slopes provide meaningful information about the relationship between the variables.

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Write each expression in factored form.

y²-13 y+12 .

Answers

Factored form refers to expressing an algebraic expression or equation as a product of its factors. It represents the expression or equation in a form where it is fully factored or broken down into its constituent parts.

To write the expression in factored form, we need to factor the quadratic expression. The quadratic expression is  

y² - 13y + 12.

To factor this quadratic expression, we need to find two numbers that multiply to give 12 and add up to give -13.

The factors of 12 are:
1, 12
2, 6
3, 4

From these factors, the pair that adds up to -13 is 1 and 12.

So, we can rewrite the expression as:
y² - 13y + 12 = (y - 1)(y - 12)

Therefore, the factored form of the expression y² - 13y + 12 is (y - 1)(y - 12).

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what is the intersection of the given lines? ae←→ and de←→ point d point, d point e point , e point a point , a ad←→

Answers

As per the graph the intersecting point of the equation has no intersecting points and they are in the form of parallel lines.

Slope of the line y = 2x + 3:

The given equation is in slope-intercept form, y = mx + b, where m represents the slope of the line. By comparing the equation y = 2x + 3 to the slope-intercept form, we can determine that the slope of this line is 2. The coefficient of x, which is 2, represents the slope.

Plotting the line y = 2x + 3:

To visualize this line, we can plot a few points on a coordinate plane and connect them to form a line. We can start by choosing different values for x and then calculate the corresponding y-values using the equation y = 2x + 3. Let's consider a few x-values and find their corresponding y-values:

For x = 0, y = 2(0) + 3 = 3.

For x = 1, y = 2(1) + 3 = 5.

For x = -1, y = 2(-1) + 3 = 1.

Slope of the line 2x - y + 5 = 0:

To find the slope of the line given by the equation 2x - y + 5 = 0, we need to rearrange the equation into slope-intercept form, y = mx + b. Let's do that:

2x - y + 5 = 0

2x + 5 = y

Comparing this to the slope-intercept form, we can see that the slope, m, is equal to 2. So the slope of the line 2x - y + 5 = 0 is also 2.

Plotting the line 2x - y + 5 = 0:

Similar to the previous line, we can plot a few points to visualize this line. Again, we can choose different x-values and find the corresponding y-values using the equation 2x - y + 5 = 0. Let's calculate a few points:

For x = 0, 2(0) - y + 5 = 0, which simplifies to -y + 5 = 0. Solving for y, we get y = 5.

For x = 1, 2(1) - y + 5 = 0, which simplifies to 2 - y + 5 = 0. Solving for y, we get y = 7.

For x = -1, 2(-1) - y + 5 = 0, which simplifies to -2 - y + 5 = 0. Solving for y, we get y = 3.

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Complete Question:

Compute the slopes of y = 2x + 3 and 2x - y + 5 = 0. The try to find the point of intersection of two lines if any.

kaelyn has some yarn that she wants to use to make hats and scarves. each hat uses 0.20.20, point, 2 kilograms of yarn and each scarf uses 0.10.10, point, 1 kilograms of yarn. kaelyn wants to make 333 times as many scarves as hats and use 555 kilograms of yarn.

Answers

Kaelyn wants to use yarn to make hats and scarves. Each hat requires 0.2 kg of yarn, while each scarf requires 0.1 kg. She plans to make 333 times more scarves than hats and use a total of 555 kg of yarn.

Let h be the number of hats and s be the number of scarves Kaelyn makes. The first equation represents the total yarn used, which is 0.2h (for hats) plus 0.1s (for scarves) equal to 555 kg. The second equation represents the ratio of scarves to hats, where s is 333 times greater than h, i.e., s = 333h. So the system of equations is:

0.2h + 0.1s = 555

s = 333h

Kaelyn plans to use her yarn to make hats and scarves, with hats requiring 0.2 kilograms of yarn and scarves needing 0.1 kilograms. She aims to make 333 times more scarves than hats using a total of 555 kilograms of yarn.

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How many seconds will a ball be in the air before it hits the ground if it is launched from the a height of 3 feet at a velocity of 1500 feet per second? assume no wind resistance.

Answers

Therefore, the ball will be in the air for approximately 0.097 seconds before it hits the ground.

To calculate the time it takes for the ball to hit the ground when launched from a height of 3 feet at a velocity of 1500 feet per second, we can use the equations of motion under constant acceleration, assuming no air resistance.

Given:

Initial height (h0) = 3 feet

Initial velocity (v0) = 1500 feet per second

Acceleration due to gravity (g) = 32.2 feet per second squared (approximately)

The equation to calculate the time (t) can be derived as follows:

h = h0 + v0t - (1/2)gt²

Since the ball hits the ground, the final height (h) is 0. We can substitute the values into the equation and solve for t:

0 = 3 + 1500t - (1/2)(32.2)t²

Simplifying the equation:

0 = -16.1t² + 1500t + 3

Now, we can use the quadratic formula to solve for t:

t = (-b ± √(b² - 4ac)) / (2a)

In this case, a = -16.1, b = 1500, and c = 3.

Using the quadratic formula, we get:

t = (-1500 ± √(1500² - 4 * (-16.1) * 3)) / (2 * (-16.1))

Simplifying further:

t ≈ (-1500 ± √(2250000 + 193.68)) / (-32.2)

t ≈ (-1500 ± √(2250193.68)) / (-32.2)

Using a calculator, we find two possible solutions:

t ≈ 0.097 seconds (rounded to three decimal places)

t ≈ 93.155 seconds (rounded to three decimal places)

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Molly planted a garden with a length of 72 feet. If she bought enough fertilizer to cover 792 square feet, what width should she make the garden?

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If Molly planted a garden with a length of 72 feet and bought enough fertilizer to cover 792 square feet, she should make the width of the garden 11 feet.

To find the width of the garden, we can use the formula for the area of a rectangle, which is length multiplied by width.

In this case, the length of the garden is given as 72 feet, and the area she wants to cover with fertilizer is 792 square feet.

Let's use "w" to represent the width of the garden. So, we have the equation:

72 * w = 792.

To solve for "w", we can divide both sides of the equation by

72: w = 792 / 72.

Simplifying the division gives us: w = 11.

Therefore, Molly should make the width of her garden 11 feet.

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What calculation will give us the estimated volume of the great pyramid of giza in cubic meters?

Answers

The estimated volume of the Great Pyramid of Giza can be calculated using the formula for the volume of a pyramid, which is (1/3) × base area × height.

To calculate the volume of the Great Pyramid of Giza, we need to find the base area and height of the pyramid. The base of the pyramid is a square, and its dimensions are approximately 230.4 meters by 230.4 meters. To find the base area, we multiply the length of one side by itself: 230.4 m × 230.4 m = 53,046.86 square meters.

The height of the Great Pyramid of Giza is approximately 146.6 meters.

Using the formula for the volume of a pyramid, we can calculate the estimated volume of the pyramid as follows: (1/3) × 53,046.86 square meters × 146.6 meters ≈ 2,583,283 cubic meters.

Therefore, the estimated volume of the Great Pyramid of Giza is approximately 2,583,283 cubic meters.

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a product is classified according to the number of defects x it contains and the label of the factory y that produces it. we know that x takes values in {0,1,2}and y takes values in {1,2}. moreover, suppose that (x,y ) has joint pmf f(x,y) satisfying f(0,1)

Answers

The probability f(0,1) = 0.18, which represents the probability that the product does not contain any defect (x=0) and comes from the factory 1 (y=1).

A joint pmf f(x,y) of two discrete random variables X and Y is defined as the probability distribution of a pair of random variables X and Y in which X can take values in {0, 1, 2} and Y takes values in {1, 2}.f(0,1) = 0.18 represents the probability that the product does not contain any defect (x=0) and comes from the factory 1 (y=1).

Here, X represents the number of defects in the product, and Y represents the label of the factory that produces it. The given information defines a joint probability distribution of the two random variables X and Y.

The joint probability mass function (pmf) is denoted by f(x,y).

The probability that the product does not contain any defect (x=0) and comes from the factory 1 (y=1) is given by f(0,1).

This value is given to be 0.18. Similarly, we can calculate the probabilities for other values of X and Y as follows:

f(0,1) = 0.18

f(1,1) = 0.22

f(2,1) = 0.10

f(0,2) = 0.24

f(1,2) = 0.16

f(2,2) = 0.10

The total probability for all possible values of X and Y is equal to 1.

In conclusion, we have calculated the joint pmf f(x,y) for two discrete random variables X and Y, where X takes values in {0, 1, 2} and Y takes values in {1, 2}. We have also calculated the probability f(0,1) = 0.18, which represents the probability that the product does not contain any defect (x=0) and comes from the factory 1 (y=1). The total probability for all possible values of X and Y is equal to 1.

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Write a system of equations to find a cubic polynomial that goes through (-3,-35),(0,1),(2,3) , and (4,7)

Answers

we have a system of three linear equations with three unknowns (a, b, and c). We can solve this system to find the values of a, b, and c.

To find a cubic polynomial that goes through the given points (-3,-35), (0,1), (2,3), and (4,7), we can set up a system of equations.

Let's assume the cubic polynomial is of the form y = ax^3 + bx^2 + cx + d.

Plugging in the x and y values for each point, we get the following system of equations:

Equation 1: (-3)^3a + (-3)^2b + (-3)c + d = -35
Equation 2: 0^3a + 0^2b + 0c + d = 1
Equation 3: 2^3a + 2^2b + 2c + d = 3
Equation 4: 4^3a + 4^2b + 4c + d = 7

Simplifying these equations, we have:

Equation 1: -27a + 9b - 3c + d = -35
Equation 2: d = 1
Equation 3: 8a + 4b + 2c + d = 3
Equation 4: 64a + 16b + 4c + d = 7

Since Equation 2 tells us that d = 1, we can substitute this value into the other equations:

Equation 1: -27a + 9b - 3c + 1 = -35
Equation 3: 8a + 4b + 2c + 1 = 3
Equation 4: 64a + 16b + 4c + 1 = 7

Now we have a system of three linear equations with three unknowns (a, b, and c). We can solve this system to find the values of a, b, and c.

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A statistics student wishes to gather a sample of high school seniors for his project. he numbers each class of senior english and selects one class at random. he then interviews each student in that particular senior english class to be in his sample. this is an example of _______ sampling.

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This is an example of random sampling. The statistics student numbers each class of senior English and selects one class at random, which ensures that each class has an equal chance of being chosen. By then interviewing each student in that particular senior English class, the student is including all members of the chosen class in his sample. Therefore, this method is considered random sampling.

What is sampling? Sampling is a method of selecting a part or subset of the population that resembles the whole population in characteristics. Random sampling is also known as probability sampling because every group has an equal probability of getting selected.

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The english premier league has a total of 20 teams. suppose that you are given an opportunity to bet for three teams that will be top in the league, what is the probability of picking the correct set of three? be sure to explain your steps using an proper discrete probability approach.

Answers

The probability of picking the correct set of three teams that will be top in the English Premier League can be calculated using the concept of combinations. The probability of picking the correct set of three teams that will be top in the English Premier League is approximately 0.000877.



Step 1: Determine the total number of possible combinations. Since there are 20 teams in the league, the total number of possible combinations of three teams can be calculated using the combination formula: ⁿCr = n! / (r! (n-r)!), where n is the total number of teams and r is the number of teams to be chosen. In this case, n = 20 and r = 3.

Using the formula, we have ²⁰C₃ = 20! / (3!(20-3)!) = 1140.

So, there are 1140 possible combinations of three teams that can be chosen from the 20 teams in the league.

Step 2: Determine the number of favorable outcomes. Since we are interested in finding the probability of picking the correct set of three teams, there is only one favorable outcome.

Step 3: Calculate the probability. The probability can be calculated by dividing the number of favorable outcomes by the total number of possible outcomes. In this case, the probability of picking the correct set of three teams is 1 / 1140 = 0.000877.

Therefore, the probability of picking the correct set of three teams that will be top in the English Premier League is approximately 0.000877.

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A fair coin is tossed 17 times. what is the probability that exactly 4 heads occur?

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The probability of exactly 4 heads occurring in 17 tosses of a fair coin is approximately 0.1323.

To calculate the probability of exactly 4 heads occurring in 17 tosses of a fair coin, we can use the binomial probability formula. The formula is:

P(X = k) = C(n, k) * p^k * q^(n-k)

Where:

P(X = k) is the probability of getting exactly k successes (in this case, 4 heads).

C(n, k) is the number of combinations of n items taken k at a time (also known as the binomial coefficient).

p is the probability of getting a head in a single toss (0.5 for a fair coin).

q is the probability of getting a tail in a single toss (0.5 for a fair coin).

n is the total number of tosses (17 in this case).

k is the number of successes (4 in this case).

Using these values, we can substitute them into the formula and calculate the probability:

P(X = 4) = C(17, 4) * (0.5)^4 * (0.5)^(17-4)

After calculating the binomial coefficient and simplifying the equation, we find:

P(X = 4) ≈ 0.1323

Therefore, the probability that exactly 4 heads occur in 17 tosses of a fair coin is approximately 0.1323.

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A train is travelling at a constant speed. The distance travelled is proportional to the time taken. In 5 minutes the train travels 13 kilometers. Complete the table with the graph.

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If we were to denote the distance as s, and the time taken as t, we would have the equation : s = kt, where k is the constant of proportionality. In this case, k = s/t = 13/5.

Applying this into the table, our results are 26, 52, 78 and 117 respectively.



Add or subtract.

1 /1-√5+ 1 / 1+√5

Answers

The sum of the fractions 1 / (1 - √5) and 1 / (1 + √5) is equal to 1 + √5. To add or subtract the given expression, 1 / (1 - √5) + 1 / (1 + √5), we need to find a common denominator. The common denominator for these two fractions is (1 - √5)(1 + √5), which simplifies to (1 - √5)(1 + √5) = 1 - √5 + √5 - 5 = -4.

Now, let's rewrite the fractions using the common denominator:

1 / (1 - √5) = (-4) * 1 / (1 - √5) = -4 / (1 - √5)
1 / (1 + √5) = (-4) * 1 / (1 + √5) = -4 / (1 + √5)

Next, we can add the two fractions:

-4 / (1 - √5) + -4 / (1 + √5)

To add fractions with different denominators, we need to find a common denominator. The common denominator for (1 - √5) and (1 + √5) is (1 - √5)(1 + √5), which we found earlier to be -4.

Multiplying each fraction by the appropriate form of 1 will allow us to obtain the common denominator:

(-4 / (1 - √5)) * ((1 + √5) / (1 + √5)) = (-4(1 + √5)) / ((1 - √5)(1 + √5)) = (-4 - 4√5) / (-4) = 1 + √5

Therefore, the sum of the fractions 1 / (1 - √5) and 1 / (1 + √5) is equal to 1 + √5.

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a music company is introducing a new line of acoustic guitars next quarter. these are the cost and revenue functions, where x represents the number of guitars to be manufactured and sold: r(x)

Answers

The company needs to sell at least 92 guitars for a total revenue of $11,040 to start making a profit.

Given:

Revenue function: R(x) = 120x

Cost function: C(x) = 100x + 1840

To find the break-even point, we set R(x) equal to C(x) and solve for x:

120x = 100x + 1840

Subtracting 100x from both sides:

20x = 1840

Dividing both sides by 20:

x = 92

Now let us determine the total revenue, we substitute x = 92 into the revenue function:

R(x) = 120x

R(92) = 120 × 92

R(92) = $11,040

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a music company is introducing a new line of acoustic guitars next quarter. these are the cost and revenue functions, where x represents the number of guitars to be manufactured and sold:

R(x)=120x

C(x)=100x+1840

The company needs to sell at least _______guitars for a total revenue of $_____ to start making a profit

Use inductive reasoning to predict the next line in the sequence of computations. use a calculator or perform the arithmetic by hand to determine whether your conjecture is correct. 4=1x4, 4+8=2x6, 4+8+12= 3x6, next equation

Answers

Using inductive reasoning, we have predicted that the next equation in the sequence is 4 + 8 + 12 + 16 = 4 × 6.

Given sequence of computations are as follows;4 = 1 × 4 4 + 8 = 2 × 6 4 + 8 + 12 = 3 × 6

Now we have to use inductive reasoning to predict the next line in the sequence of computations, using a calculator or performing the arithmetic by hand to determine whether the conjecture is correct.So, Let's find the next term using the same pattern as above.4 + 8 + 12 + 16 = 4 × 6We get, LHS = 40 = 4 + 8 + 12 + 16 and RHS = 4 × 6 = 24Therefore, the next equation in the sequence is 4 + 8 + 12 + 16 = 4 × 6. Explanation:This sequence of computations uses inductive reasoning to determine the relationship between the value of x and the result of the equation. We can see that the pattern involves adding the next multiple of x each time we increase the number of terms. For example, the first term is 4, which is 1 times 4. The second term is 4 + 8, which is 2 times 6. The third term is 4 + 8 + 12, which is 3 times 6. Therefore, we can predict that the next term in the sequence will be 4 + 8 + 12 + 16, which is 4 times 6.

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Simplify each radical expression.

- √32

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To simplify the radical expression -√32, break it down into its prime factors, rewrite as -√(2^5), and then simplify as -2^(5/2). Multiplying the coefficient (-2) with the exponent (5/2) gives -2 * 2^(1/2), resulting in a simplified radical expression of -2√2.

To simplify the radical expression -√32, we can break down the number 32 into its prime factors.
The prime factorization of 32 is 2 * 2 * 2 * 2 * 2 = 2^5.

Next, we can rewrite the radical expression as -√(2^5).

Since the square root of a number is equal to the number raised to the power of 1/2, we can rewrite -√(2^5) as -2^(5/2).

Finally, we can simplify -2^(5/2) by multiplying the coefficient (-2) with the exponent (5/2). This gives us -2 * 2^(1/2).

Therefore, the simplified radical expression for -√32 is -2√2.

In summary, to simplify the radical expression -√32, we break down 32 into its prime factors, rewrite it as -2^(5/2), and then simplify it to -2√2.

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