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The probability is D. 0.7807. Therefore, the answer is D. 0.7807.

To calculate the power of the test, we need to determine the probability of rejecting the null hypothesis when the alternative hypothesis is true. In other words, we want to find P(reject H0 | Ha is true).

First, we need to calculate the critical value that corresponds to the level of significance of the test. Since the alternative hypothesis is one-tailed (Ha:μ>100), and the level of significance is not given, we'll assume a significance level of 0.05 (commonly used in hypothesis testing).

Using a standard normal distribution table or calculator, we find that the critical value for a one-tailed test at a 0.05 level of significance is 1.645.

Next, we need to calculate the standard error of the mean (SEM), which is equal to the population standard deviation divided by the square root of the sample size.

SEM = 8 / √60 = 1.0328

To find the test statistic (z-score) for the alternative hypothesis, we use the following formula:

z = (x¯ - μ) / SEM

z = (101.7 - 102.5) / 1.0328 = -0.775

The area to the right of this z-score under the standard normal distribution represents the probability of rejecting the null hypothesis when the alternative hypothesis is true.

Using a standard normal distribution table or calculator, we find this probability to be:

P(z > -0.775) = 0.7807

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The probability is D. 0.7807. Therefore, the answer is D. 0.7807.

Using a standard normal distribution table or calculator, we find that the critical value for a one-tailed test at a 0.05 level of significance is 1.645.

Next, we need to calculate the standard error of the mean (SEM), which is equal to the population standard deviation divided by the square root of the sample size.

= 8 / √60 = 1.0328

To find the test statistic (z-score) for the alternative hypothesis, we use the following formula:

z = (x - μ) / SEM

z = (101.7 - 102.5) / 1.0328 = -0.775

Using a standard normal distribution table or calculator, we find this probability to be:

P(z > -0.775) = 0.7807

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The area of the horizontal cross-section at height y is given by A = πr², which becomes A = π(y/4)² = (π/16)y².

Using similar triangles, we can determine the area of a horizontal cross-section at height y of a right circular cone with height h=20 and base radius R=5. Since the cross-section forms a smaller similar cone, the ratio of the height to the radius remains constant. This relationship is expressed as y/h = r/R, where r is the cross-sectional radius at height y. Solving for r, we get r = (y×R)/h = (5×y)/20 = y/4. The area of the horizontal cross-section at height y is given by A = πr², which becomes A = π(y/4)² = (π/16)y².

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By applying the Laplace transform to the given boundary-value problem and following the procedure outlined in Example 10, the solution for y(t) is obtained as y(t) = 6e^(-t).

The Laplace transform can be used to solve differential equations, including boundary-value problems. In this case, we have the second-order linear homogeneous differential equation y'' + 2y' + y = 0, with the initial conditions y'(0) = 6 and y(1) = 6.

To solve the problem using the Laplace transform, we apply the transform to the differential equation and the initial conditions. This transforms the differential equation into an algebraic equation that can be solved for the Laplace transform of y(t), denoted as Y(s).

By applying the Laplace transform to the given differential equation, we obtain the algebraic equation s^2Y(s) + 2sY(s) + Y(s) = 0. Solving this equation for Y(s), we find Y(s) = 6s/(s^2 + 2s + 1).

To find the inverse Laplace transform of Y(s) and obtain the solution y(t), we use partial fraction decomposition and consult Laplace transform tables. By applying the inverse Laplace transform, we find y(t) = 6e^(-t).

Therefore, the solution for the given boundary-value problem is y(t) = 6e^(-t)

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The given system of equation 2x + 4y = 1, 2x + 4y = 1  is an example of a dependent system of equations.

A dependent system of equations is a system of equations where there are an infinite number of solutions, and the equations share the same solution set.

We have to find the relationship between the given equations to determine whether the system is dependent or independent.In this case, both equations are identical.

2x + 4y = 1 is the same as 2x + 4y = 1.

The equations have the same coefficients and the same constant term, which implies that they are parallel lines and coincide with each other.

Thus, the given system of equation 2x + 4y = 1, 2x + 4y = 1

is an example of a dependent system of equations as they share the same solution set.

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The equation that best supports the given scenario is 18x - 36 = 234, where 'x' represents the cost per banner.

Let's break down the information provided in the problem. Debra printed 18 banners and received a discount of $36 off her entire purchase. If we let 'x' represent the cost per banner, then the total cost of the banners before the discount would be 18x dollars.

Since she received a discount of $36, her total cost after the discount is 18x - 36 dollars.

According to the problem, Debra paid a total of $234 after the discount. Therefore, we can set up the equation as follows: 18x - 36 = 234. By solving this equation, we can determine the value of 'x,' which represents the cost per banner.

To solve the equation, we can begin by isolating the term with 'x.' Adding 36 to both sides of the equation gives us 18x = 270. Then, dividing both sides by 18 yields x = 15.

Therefore, the cost per banner is $15.

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We cannot make an estimate of the number of students who dislike cleaning their rooms as their least favorite chore.

The question provides no data regarding the number of students who dislike cleaning their rooms as their least favorite chore. Therefore, we cannot make a logical estimate. The number of students who dislike cleaning their rooms may be as few as zero, or it may be more than half of the total number of students.

The conclusion is that we cannot make an estimate of the number of students who dislike cleaning their rooms as their least favorite chore.

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Answer:

a

Step-by-step explanation:

Answer:

the answer would be the first one

Step-by-step explanation:

The period of the oscillatory motion is determined as 10 seconds.

The time taken for an oscillating particle to complete one cycle of oscillation is known as the Period of the oscillating particle.

The period of an oscillatory motion is denoted by T. The S.I. unit of time period is second.

The period of an oscillatory motion is equal to the reciprocal of the frequency of the oscillation.

Mathematically, the formula or relationship is given as;

f = n/t

T = 1/f

T = t/n

where;

Looking at the graph, we can see that one complete cycle of the motion is between 3.5 and 13.5

Period of the motion = ( 13.5 - 3.5 ) / 1

Period of the motion = 10 s

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Stock B will cost $325.00 more than Stock A at the end of 4 years.

Given that Stock A doubles in price by the end of every year, while Stock B triples in price by the end of every year.

If they both start off at $5.00, we need to determine how much more will Stock B cost than Stock A at the end of 4 years. We need to determine how much more Stock B will cost than Stock A at the end of 4 years if they both start off at $5.00.

Solution: We can represent the price of Stock A and Stock B at the end of the 4th year as:

Price of Stock A = $5.00 × 2 × 2 × 2 × 2 = $80.00

Price of Stock B = $5.00 × 3 × 3 × 3 × 3 = $405.00

The difference in the price of Stock B and Stock A at the end of the 4th year is:

Price of Stock B - Price of Stock A = $405.00 - $80.00 = $325.00

Stock B will cost $325.00 more than Stock A at the end of 4 years.

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1. The term used to describe an association or interdependence between two sets of data or variables is "Correlation Analysis."

Correlation Analysis is a statistical method used to determine the strength and direction of the relationship between two variables.

2. The graphic tool used to illustrate the relationship between two variables is called a "Scatter Diagram."

Explanation: A Scatter Diagram is a graphical representation of data points that shows the relationship between two variables, often using dots or other symbols to represent each observation.

3. The term represented by the symbol 'r' in correlation and regression analysis is "Pearson Correlation Coefficient."

The Pearson Correlation Coefficient measures the linear relationship between two variables, with values ranging from -1 to 1.

4. True statement: Correlation does not imply causation.

Understanding correlation analysis, scatter diagrams, and the Pearson Correlation Coefficient is crucial for interpreting relationships between variables in various fields, such as business, social sciences, and natural sciences.

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If x is a non-zero rational number and y is an irrational number, then y/x is irrational: TRUE

Assume that y/x is rational.

This means that we can write y/x as a fraction in the form a/b, where a and b are integers and b is non-zero.
y/x = a/b

Multiplying both sides by x, we get:
y = ax/b

Since x is a rational number, it can be expressed as a fraction in the form c/d, where c and d are integers and d is non-zero.
x = c/d

Substituting x with c/d in the above equation, we get:
y = ac/bd

Now, we have expressed y as a fraction, which contradicts the given fact that y is an irrational number. Hence, our assumption that y/x is rational must be false.
Therefore, y/x is irrational.

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Answer:

0.31 g

Explanation:

To find out how much pepper Haley has left, we need to subtract the amount she used from the amount she started with:

0.7 g - 0.39 g = 0.31 g

Therefore, Haley has 0.31 grams of pepper left.

The determinant of the matrix b = -2a^4 is -648.

Given: det(a) = 3

To find: det(b) = det(-2a^4)

Solution:

We know that det(kA) = k^n * det(A) where A is a square matrix of order n.

So, det(-2a^4) = (-2)^3 * det(a^4)

Now, using the property det(AB) = det(A) * det(B), we can write:

det(a^4) = det(a) * det(a) * det(a) * det(a) = (det(a))^4 = 3^4 = 81

Therefore, det(-2a^4) = (-2)^3 * 81 = -648

Hence, the determinant of the matrix b = -2a^4 is -648.

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To evaluate the line integral, we need to parameterize the curve, calculate ds, and then substitute the parameterization into the integral expression.

To evaluate the line integral ∫c xyz² ds, where c is the line segment from (-3, 5, 0) to (-1, 6, 4), we need to parameterize the curve and calculate the line integral using the parameterization.

Let's parameterize the curve c(t) from t = 0 to t = 1:

x(t) = -3 + 2t

y(t) = 5 + t

z(t) = 4t

Now, we need to calculate the derivative of each component with respect to t to find ds:

dx/dt = 2

dy/dt = 1

dz/dt = 4

ds = √((dx/dt)² + (dy/dt)² + (dz/dt)²) dt

= √(4 + 1 + 16) dt

= √(21) dt

Now, we can substitute the parameterization and ds into the line integral:

∫c xyz² ds = ∫[0,1] (x(t) * y(t) * z(t)²) * √(21) dt

= ∫[0,1] (-3 + 2t)(5 + t)(4t)² * √(21) dt

Now we can proceed to evaluate the line integral by plugging in the parameterization and limits of integration into the expression and calculating the integral.

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The equation of the curve is: y = x^2 + 3x - 2. The correct option is (D).

We can use the fact that the slope of the curve at each point (x,y) is given by 2x+3 to find the equation of the curve. We know that the curve passes through the point (1,2), so we can use this point to find the constant of integration in our equation.

Integrating the slope equation with respect to x, we get:

y = x^2 + 3x + C

To find the constant C, we plug in the coordinates of the point (1,2):

2 = 1^2 + 3(1) + C
C = -2

So the equation of the curve is:
y = x^2 + 3x - 2

Looking at the answer choices, we see that option D) matches this equation, so the answer is D).

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The conformal map from the horizontal strip {-a < Im(z) < a} onto the right half-plane {Re(w) > 0} is given by h(z) = [tex]e^(πiz / a)[/tex].

What is exponential function?

The exponential function is a function of the form f(x) = [tex]e^x[/tex], where e is Euler's number (approximately equal to 2.71828) and x is the input variable. The exponential function is commonly used in various areas of mathematics, physics, and engineering due to its fundamental properties.

The exponential function can be used to locate a conformal projection onto the right half-plane Re(w) > 0 from the horizontal strip -a Im(z) a. onto the right half-plane {Re(w) > 0}, we can use the exponential function. The key is to map the strip onto the upper half-plane first, and then apply another transformation to map the upper half-plane onto the right half-plane.

Step 1: Map the strip onto the upper half-plane

Consider the function f(z) = [tex]e^(πiz / (2a)[/tex]). This function maps the strip {-a < Im(z) < a} onto the upper half-plane.

Step 2: Map the upper half-plane onto the right half-plane

To map the upper half-plane onto the right half-plane, we can use the transformation g(w) = w², which squares the complex number w.

Combining these two steps, we have the conformal map from the horizontal strip onto the right half-plane:

h(z) = g(f(z)) = [tex](e^(πiz / (2a))[/tex])² = [tex]e^(πiz / a)[/tex].

Therefore, the conformal map from the horizontal strip {-a < Im(z) < a} onto the right half-plane {Re(w) > 0} is given by h(z) = [tex]e^(πiz / a)[/tex].

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The solution to the Towers of Hanoi problem with 7 discs requires approximately 127 moves.

The Towers of Hanoi problem is a classic mathematical puzzle that involves moving a stack of discs from one peg to another while following specific rules.

The problem involves three pegs and a set of discs of different sizes, with the goal being to move the entire stack from the starting peg to the ending peg.

The rules are that only one disc can be moved at a time, and a larger disc cannot be placed on top of a smaller disc.
To find the solution to the Towers of Hanoi problem with 7 discs, we can use the formula [tex]2^n[/tex]- 1,

There n is the number of discs.

Therefore, the solution to the Towers of Hanoi problem with 7 discs would require approximately [tex]2^7[/tex] - 1 = 127 moves.
This may seem like a lot of moves, but it is important to note that the number of moves required increases exponentially with the number of discs.

For example, the solution to the problem with 8 discs would require approximately [tex]2^8[/tex] - 1 = 255 moves and the solution with 9 discs would require approximately 2^9 - 1 = 511 moves.
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The required answer is  the mean sales for all stores last month were indeed more than 20.

Based on the given information, you want to set up null and alternative hypotheses to test if there's convincing evidence that the mean sales of can openers for all stores last month was more than 20. Here's how you can set up the hypotheses:
The null hypothesis would be that the mean can opener sales for all stores last month is equal to 20.
Null hypothesis (H0): The mean sales of can openers for all stores last month was equal to 20.
H0: μ = 20
while the alternative hypothesis would be that the mean can opener sales for all stores last month.
Alternative hypothesis (H1): The mean sales of can openers for all stores last month was more than 20.
H1: μ > 20
where μ is the population mean can opener sales for all stores last month.
To test these hypotheses, you'll need to perform a hypothesis test (e.g., a one-sample t-test) using the given sample data of can opener sales from 50 stores. If the test result provides enough evidence to reject the null hypothesis, you can conclude that the mean sales for all stores last month were indeed more than 20.

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The correct choice is A. The polynomial has a real zero on the given interval because f(-4) and f(-3) are both negative. To apply the Intermediate Value Theorem, we need to show that the function changes sign between the endpoints of the interval.

Evaluating the function at the endpoints, we find that f(-4) = 117 and f(-3) = 48. Since both values are negative, the function changes sign at some point within the interval. Since f(-4) and f(-3) are both negative, we can conclude that the function must have a zero in the interval [-4, -3]. To approximate the zero, we can use numerical methods such as the bisection method or Newton's method. However, since you only asked for the correct choice and a summary, the exact value of the zero is not necessary for this question.

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The customer was overcharged by $5.28.

A customer shows you their receipt and states they were overcharged.

The customer’s receipt shows a license fee of $36.00, registration fee of $12.00, and a local tax rate of 7%.

The customer was charged $56.64. How much money was the customer overcharged?

To find out the overcharged amount of money of the customer, we need to calculate the total cost as follows:

Total cost = License fee + Registration fee + (License fee + Registration fee) × Tax rate

                 = $36 + $12 + ($36 + $12) × 7% = $48 + $3.36= $51.36

The total cost of the fees plus tax was $51.36.

As we know, the customer was charged $56.64, so the customer was overcharged by $56.64 – $51.36 = $5.28.

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The statement "A disadvantage of electronic questionnaires is that this way of surveying is relatively expensive." is: B. False.

In Science, a sample survey simply refers to a type of observational study that uses various data collection methods such as questionnaires and interviews, which favors it in revealing correlations between two data variables.

In Science, a question can be defined as a group of words or sentence that are developed, so as to elicit an information in the form of answer from an individual such as a student.

In conclusion, an advantage of of electronic questionnaires is that it is a form of sample survey that is relatively less expensive in comparison with other forms of survey.

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(a) Using the property that (a^b)^c = a^(bc), we can simplify e^(-7/6) as e^((-7/6)(1/7)). Simplifying further, we have e^(-1/6) as the simplified expression.

(b) Using the property that a^b * a^c = a^(b+c), we can simplify e^4 * e^(-1/2) as e^(4 + (-1/2)). Simplifying further, we have e^(7/2) as the simplified expression.

(c) Using the property that a^(-b) = 1/(a^b), we can simplify e^(-4) * e^(-5) as (1/e^4) * (1/e^5). Using the property that a^b * a^c = a^(b+c), we can simplify further as 1/(e^(4+5)) = 1/e^9.

(d) Using the property that a^(-b) = 1/(a^b), we can simplify e^(-8) * e^(-3/2) as (1/e^8) * (1/e^(3/2)). Using the property that a^b * a^c = a^(b+c), we can simplify further as 1/(e^(8 + 3/2)) = 1/e^(19/2).

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the flux of the vector field through the square is 44.

To calculate the flux of the vector field vector f = (y, 11)vector j through a square of side 2 in the plane y = 10 oriented in the negative y direction, we can use the flux form of Gauss's law:

Φ = ∫∫S F · n dS

where S is the surface, F is the vector field, n is the unit normal vector to the surface, and dS is the differential surface area.

Since the surface is a square of side 2 in the plane y = 10, we can parameterize it as:

r(u, v) = (u, 10, v)

where 0 ≤ u,v ≤ 2.

The normal vector to the surface is given by:

n = (-∂r/∂u) × (-∂r/∂v)

= (-1, 0, 0) × (0, 0, 1)

= (0, 1, 0)

So, the flux becomes:

Φ = ∫∫S F · n dS

= ∫∫S (y, 11)vector j · (0, 1, 0) dS

= ∫∫S 11 dS (since y = 10 on the surface)

= 11 ∫∫S dS

Since the surface is a square of side 2, its area is 4. So, the flux is:

Φ = 11 ∫∫S dS = 11(4) = 44.

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If f is continuous and 4. 2∫ f(x) dx = 9, evaluate ∫ f (2x) dx will be 9/4.

Using the substitution u = 2x, we have:

∫ f(2x) dx = 1/2 ∫ f(u) du

Now, let's use the given information:

2∫ f(x) dx = 9

∫ f(x) dx = 9/2

Substituting this in our expression, we get:

∫ f(2x) dx = 1/2 ∫ f(u) du = 1/2 ∫ f(x) dx [using u = 2x]

= 1/2 × (9/2)

= 9/4

Therefore, the value of ∫ f(2x) dx is 9/4.

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To evaluate ∫ f(2x) dx, we can use the substitution u=2x, which means du/dx=2, or dx=du/2. Substituting this into the integral, we get: ∫ f(2x) dx = ∫ f(u) (du/2)

We can then rewrite the original equation as:

∫ f(x) dx = (9/2)

Substituting this into the integral we want to evaluate, we get:

2∫ f(x) dx = 2(9/2) = 9

Substituting this into our expression for ∫ f(2x) dx, we get:

∫ f(2x) dx = (1/2)∫ f(x) dx = (1/2)(9/2) = 9/4

Therefore, we have evaluated the integral ∫ f(2x) dx to be 9/4, using the given information that f is continuous and 2∫ f(x) dx = 9. To evaluate the integral ∫₀^2 f(2x) dx, first perform a substitution. Let u = 2x, so du = 2 dx. When x = 0, u = 0; when x = 2, u = 4. Now the integral becomes:

(1/2)∫₀^4 f(u) du.

We're multiplying by 1/2 because du = 2 dx, so dx = (1/2) du.

Since f is continuous and ∫₀^4 f(x) dx = 9, we can now evaluate the new integral:

(1/2) * 9 = 4.5.

So, ∫₀^2 f(2x) dx = 4.5.

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The series ∑(n=1 to ∞) sin([tex]n^6[/tex]/n) is absolutely convergent and the series ∑(n=1 to ∞) [tex](-1)^{n}/n^2[/tex] is conditionally convergent.

For the series ∑(n=1 to ∞) sin([tex]n^6[/tex]/n), we can determine its convergence properties using various tests.

First, let's consider the series ∑(n=1 to ∞) sin([tex]n^6[/tex]/n). Since sin(x) is a bounded function, we can apply the Comparison Test to determine whether the series converges absolutely, conditionally, or diverges.

Comparison Test states that if 0 ≤ |aₙ| ≤ bₙ for all n, and ∑(n=1 to ∞) bₙ converges, then ∑(n=1 to ∞) aₙ converges absolutely.

In this case, we have |sin([tex]n^6[/tex]/n)| ≤ 1 for all n. Therefore, we can compare the series to the series ∑(n=1 to ∞) 1, which is a geometric series with a common ratio of 1 and converges.

Since the series ∑(n=1 to ∞) 1 converges, and |sin([tex]n^6[/tex]/n)| ≤ 1 for all n, we can conclude that the given series ∑(n=1 to ∞) sin([tex]n^6[/tex]/n) converges absolutely.

Therefore, the series ∑(n=1 to ∞) sin([tex]n^6[/tex]/n) is absolutely convergent.

As for the series ∑(n=1 to ∞)[tex](-1)^{n}/n^2[/tex], we can determine its convergence properties using the Alternating Series Test.

Alternating Series Test states that if the terms of a series alternate in sign, decrease in absolute value, and tend to zero, then the series converges.

In this case, the terms of the series alternate in sign [tex](-1)^n[/tex], decrease in absolute value (1/[tex]n^2[/tex]), and tend to zero as n approaches infinity.

Therefore, the series ∑(n=1 to ∞) [tex](-1)^{n}/n^2[/tex] converges conditionally.

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The probability of getting two "1's" out of three draws without replacement from the box is 0.3, which matches the first option.

To find the probability of getting two "1's" out of three draws without replacement from a box containing 5 tickets, we can use the following steps:

Step 1: Determine the total number of possible ways to draw three tickets from the box without replacement. This can be calculated using the formula for combinations:

C(5, 3) = 5! / (3! * 2!) = 10

Step 2: Determine the number of ways to draw two "1's" and one other ticket. There are two "1's" in the box, so we can choose two of them in C(2, 2) = 1 way. The third ticket can be any of the remaining three tickets in the box, so we can choose it in C(3, 1) = 3 ways. Thus, there are 1 x 3 = 3 ways to draw two "1's" and one other ticket.

Step 3: Calculate the probability of getting two "1's" by dividing the number of ways to draw two "1's" and one other ticket by the total number of possible draws:

P(two "1's") = 3 / 10

Therefore, the probability of getting two "1's" out of three draws without replacement from the box is 0.3, which matches the first option.

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Log (6) lies between 0 and 1 exclusive and it is a positive number since it is a logarithm of a number greater than 1.

The justification why log (6) must have a value less than 1 but greater than 0 is as follows:Justification:

The logarithmic function is a one-to-one and onto function, whose domain is all positive real numbers and the range is all real numbers, and for any positive real number b and a, if we have b > 1, then log b a > 0, and if we have 0 < b < 1, then log b a < 0.

For log (6), we can use a change of base formula to find that:log (6) = log(6) / log(10) = 0.7781, which is less than 1 but greater than 0, since 0 < log(6) / log(10) < 1, thus, log (6) must have a value less than 1 but greater than 0.

Therefore, log (6) lies between 0 and 1 exclusive and it is a positive number since it is a logarithm of a number greater than 1.

Thus, the justification of why log (6) must have a value less than 1 but greater than 0 is proven.

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The sequence converges to 4.

We can begin by finding the limit of sin(4/n) as n approaches infinity. We know that as x approaches 0, sin(x)/x approaches 1. So we can rewrite sin(4/n)/4/n as (sin(4/n)/4/n) * (4/n)/1, which simplifies to sin(4/n)/4 * n.

Thus, as n approaches infinity, sin(4/n)/4 approaches 1, and the sequence {n sin (4/n)} approaches 4 * infinity, which is infinity. Therefore, the sequence diverges.

However, if we consider the modified sequence {sin(4/n)/(1/n)}, we can see that it is of the form 0/0, which is indeterminate. We can apply L'Hopital's rule to get lim n->infinity sin(4/n)/(1/n) = lim n->infinity (cos(4/n) * (-4/n^2)) = 0.

Therefore, by the squeeze theorem, we can conclude that {sin(4/n)/(1/n)} converges to 0, and {n sin(4/n)} approaches 4 * 0 = 0 as well.

Thus, the original sequence does not converge, but the modified sequence converges to 0.

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The relation r on a is an equivalence relation.

To show that the relation r defined on a, where a = z × z, is an equivalence relation, we need to demonstrate three properties: reflexivity, symmetry, and transitivity.

1. Reflexivity: For all (a, b) in a, (a, b) r (a, b).

This means that for any complex number (a, b), we have a * b = a * b, which is true. Therefore, the relation is reflexive.

2. Symmetry: For all (a, b) and (c, d) in a, if (a, b) r (c, d), then (c, d) r (a, b).

Suppose (a, b) r (c, d), which means a * d = c * b. We need to show that (c, d) r (a, b), i.e., c * b = a * d.

By symmetry, the equality a * d = c * b holds, and we can rearrange it to obtain c * b = a * d. Thus, the relation is symmetric.

3. Transitivity: For all (a, b), (c, d), and (e, f) in a, if (a, b) r (c, d) and (c, d) r (e, f), then (a, b) r (e, f).

Since the relation r on a satisfies all three properties of reflexivity, symmetry, and transitivity, it is an equivalence relation.

In summary, the relation r defined on a, where a = z × z, is an equivalence relation.

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The expression of [tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\[/tex] in  fraction in simplest form can be written as  [tex]\frac{4}{25} \ *z^{16}[/tex]

An element of a whole can be described as fraction however the number  can be expressed mathematically as a quotient, and the numerator and denominator  is been divided into two where Both are integers in a simple fraction , it should be noted that the proper fraction  will be less than the denominator.

Given that

[tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\[/tex]

This can be simplified as

[tex]\frac{20z^{10} }{(5z^{-2}) ^{3} } \\\\\\\\\\[/tex]

[tex]\frac{20z^{10} }{(125*z^{-2}) ^{3}}[/tex]

= [tex]\frac{20z^{10}}{125 * z^{-6} }[/tex]

We can divide both up and the denominator by 5

= [tex]\frac{4z^{10}}{25 * z^{-6} }[/tex]

[tex]= \frac{4}{25} \ *z^{16}.[/tex]

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