At a sale, dresses were sold for $192 each. This price was 96% of the dress's original price. How much did a dress originally cost?​

To evaluate the integral of x^10 dx, you will use the power rule for integration. The power rule states that the integral of x^n dx is x^(n+1)/(n+1) + C, where n is a constant, and C is the constant of integration. In this case, n = 10.

∫x^10 dx = x^(10+1)/(10+1) + C = x^11/11 + C


1. Identify the power of x (n) which is 10.
2. Apply the power rule for integration: x^(n+1)/(n+1) + C.
3. Substitute n with 10: x^(10+1)/(10+1) + C.
4. Simplify: x^11/11 + C.

Now, let's check the answer by differentiating:

d/dx (x^11/11 + C) = 11x^10/11 + 0 = x^10


The integral of x^10 dx is x^11/11 + C, and the differentiation of our answer confirms its correctness.

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(a) The quadratic form Q(x, y, z) can be expressed as the difference of two sums of perfect squares with positive coefficients as follows:

[tex]Q(x, y, z) = (x^2 - 2xy + y^2) + (4xz - 6yz + 3y^2 - 2z^2) = (x - y)^2 + (2z - 3y)^2 - 2y^2[/tex]

In this form, we have the difference of two perfect squares: (x - y) and (2z - 3y)², both with positive coefficients. The term -2y² can also be considered as a perfect square with a negative coefficient.

(b) By looking at the expression for Q(x, y, z) obtained in part (a), we can observe that the critical point of f(x, y, z) = 12 + Q(x, y, z) occurs when (x - y) = 0 and (2z - 3y) = 0. Simplifying these equations, we find x = y and z = (3/2)y.

Substituting these values back into f(x, y, z), we get f(0, 0, 0) = 12. Therefore, at the critical point (0, 0, 0), the value of the function f(x, y, z) is 12.

To classify the critical point, we can analyze the Hessian matrix of the function f(x, y, z) at (0, 0, 0). However, since the Hessian matrix involves second-order partial derivatives, it is not possible to determine its values solely from the given information.

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To determine the drag on the 1-m-diameter circular disk, we need to first find the area of the disk, which is A = πr^2 = π(0.5m)^2 = 0.785m^2. Using the right endpoint approximation, we can approximate the pressure at each segment as the pressure at the right endpoint of the segment. Then, we can calculate the force on each segment by multiplying the pressure by the area of the segment. Finally, we can sum up all the forces on the segments to find the total drag on the disk. The calculation yields a drag force of approximately 263.4 N.

The right endpoint approximation is a method used to approximate the value of a function at a particular point by using the value of the function at the right endpoint of an interval. In this case, we can use this method to approximate the pressure at each segment of the disk by using the pressure value at the right endpoint of the segment. We then multiply each pressure value by the area of the corresponding segment to find the force on that segment. Summing up all the forces on the segments will give us the total drag force on the disk.

In summary, to determine the drag on the circular disk given the pressure distribution, we need to use the right endpoint approximation to approximate the pressure at each segment of the disk. We then find the force on each segment by multiplying the pressure by the area of the segment and summing up all the forces on the segments to obtain the total drag force on the disk.

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Elena's total sales and expenses will amount to $54 for booth cost, $9.50 per box for materials, and $11 per box for sales. The number of boxes needed to cover the expenses depends on the calculation of the breakeven point.

Elena's expenses consist of the booth cost and the materials for each box of cards. The booth cost is $54. The materials for each box cost $9.50. To calculate the breakeven point, we need to determine how many boxes Elena needs to sell to cover her expenses.

Let's assume Elena sells X boxes of cards. The total expenses can be calculated as $54 (booth cost) + $9.50 (material cost per box) * X (number of boxes). The total sales will be $11 (selling price per box) * X (number of boxes).

To find the breakeven point, we need the total sales to equal the total expenses. So, we set up the equation: $54 + $9.50X = $11X.

Simplifying the equation, we get $54 = $1.50X.

Dividing both sides by $1.50, we find X = 36.

Therefore, Elena needs to sell 36 boxes of cards to cover her expenses. The total sales will be $11 (selling price per box) * 36 (number of boxes) = $396. The total expenses will be $54 (booth cost) + $9.50 (material cost per box) * 36 (number of boxes) = $342.

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The length of the path described by the parametric equations x = cos(3t) and y = sin(3t) for 0 ≤ t ≤ π/2 is 3(π/2).

To find the length of the path, we need to use the formula for arc length:

L = integral from a to b of √(dx/dt)² + (dy/dt)² dt

where a and b are the starting and ending values of t.

Here, we have x = cos(3t) and y = sin(3t). Therefore,

dx/dt = -3sin(3t) and dy/dt = 3cos(3t)

Now, we can substitute these into the formula for arc length:

L = integral from 0 to π/2 of √((-3sin(3t))² + (3cos(3t))²) dt

L = integral from 0 to π/2 of √(9sin²(3t) + 9cos²(3t)) dt

L = integral from 0 to pi/2 of 3 dt

L = [tex]3[t]_0^{(\pi/2)[/tex] = 3(pi/2)

The length of the path described by the parametric equations x = cos(3t) and y = sin(3t) for 0 ≤ t ≤ π/2 is 3(π/2).

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The length of the path described by the parametric equations x = cos(3t) and y = sin(3t), for 0 ≤ t ≤ π/2, is given by the integral of the square root of the sum of the squares of the derivatives of x and y with respect to t.

Using the Pythagorean identity sin²θ + cos²θ = 1, we can simplify the length integral as follows:

L = ∫[0,π/2] √((dx/dt)² + (dy/dt)²) dt

L = ∫[0,π/2] √((-3sin(3t))² + (3cos(3t))²) dt

L = ∫[0,π/2] √(9sin²(3t) + 9cos²(3t)) dt

L = ∫[0,π/2] √9(dt)

L = 3 ∫[0,π/2] dt

L = 3[t] [0,π/2]

L = 3(π/2 - 0)

L = 3π/2

Therefore, the length of the path described by the given parametric equations for 0 ≤ t ≤ π/2 is 3π/2 units.

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Complete Question

the length of the path described by the parametric equations x=cos3t and y=sin3t , for 0≤t≤π2 is given by                   .

By using the unitary method, we found that the number of each type of hat is 1,526.

Let's assume that the number of each type of hat available for sale is x. According to the problem, the total number of hats in the Hat Hut is 4,578. Since there are three types of hats (cowboy hats, sun hats, and baseball hats) and each type has the same number of hats, we can set up the following equation:

3x = 4,578

Now, we need to solve this equation to find the value of x. To do that, we'll divide both sides of the equation by 3:

3x / 3 = 4,578 / 3

x = 1,526

So, the value of x, which represents the number of each type of hat, is 1,526.

Since we want to determine the number of baseball hats available, we can conclude that there are 1,526 baseball hats for sale at the Hat Hut.

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Complete Question:

The Hat Hut has a selection of 4,578 hats. An equal number of cowboy hats, sun hats, and baseball hats are for sale. How many baseball hats are for sale at the Hat Hut

The slope of the tangent line at a=pi/4 is -5/sqrt(2), the equation of the tangent line at a=pi is y = 2x - 2pi + 9, at a=pi/2, f(x) is decreasing, and at a=3pi/2, the tangent line lies above the curve.

A) To find the slope of the tangent line at a given point a, we need to find the derivative of f(x) at that point. The derivative of f(x) is given by:

f'(x) = -3sin(x) - 2cos(x)

Thus, the slope of the tangent line at a=pi/4 is:

f'(pi/4) = -3sin(pi/4) - 2cos(pi/4) = -3/sqrt(2) - 2/sqrt(2) = -5/sqrt(2)

B) To find the equation of the tangent line at a given point a, we need to use the point-slope form of the equation:

y - f(a) = f'(a)(x - a)

At the point a=pi, we have:

f(pi) = 3cos(pi) - 2sin(pi) + 6 = 3 - 0 + 6 = 9

f'(pi) = -3sin(pi) - 2cos(pi) = 0 - (-2) = 2

Thus, the equation of the tangent line is:

y - 9 = 2(x - pi)

Simplifying, we get:

y = 2x - 2pi + 9

C) To determine whether f(x) is increasing or decreasing at a given point a without graphing, we need to look at the sign of the derivative. If f'(a) > 0, then f(x) is increasing at that point. If f'(a) < 0, then f(x) is decreasing at that point. If f'(a) = 0, then we need to look at the second derivative to determine whether the function is concave up or down.

At the point a=pi/2, we have:

f'(pi/2) = -3sin(pi/2) - 2cos(pi/2) = -3 - 0 = -3

Since f'(pi/2) < 0, we can conclude that f(x) is decreasing at that point.

D) To determine whether the tangent line lies above or below the curve at a given point a without graphing, we need to look at the sign of the difference between f(x) and the equation of the tangent line. If f(x) - tangent line > 0, then the tangent line lies below the curve. If f(x) - tangent line < 0, then the tangent line lies above the curve. If f(x) - tangent line = 0, then the tangent line is tangent to the curve at that point.

At the point a=3pi/2, we have:

f(3pi/2) = 3cos(3pi/2) - 2sin(3pi/2) + 6 = 0 - (-2) + 6 = 8

f'(3pi/2) = -3sin(3pi/2) - 2cos(3pi/2) = 0 - (-2) = 2

Using the point-slope form of the equation, we can find the equation of the tangent line at that point:

y - 8 = 2(x - 3pi/2)

Simplifying, we get:

y = 2x - 6pi + 8

To determine whether the tangent line lies above or below the curve, we need to evaluate f(3pi/2) - tangent line:

f(3pi/2) - (2(3pi/2) - 6pi + 8) = 8 - pi + 8 = 16 - pi

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Explanation: The process used to solve this problem is the Euclidean algorithm, which involves finding the greatest common divisor (gcd) of two numbers by performing a sequence of division and remainder operations. In this case, gcd(82, 26) is found by dividing 82 by 26 to get a quotient of 3 and a remainder of 4, then dividing 26 by 4 to get a quotient of 6 and a remainder of 2, and finally dividing 4 by 2 to get a quotient of 2 and a remainder of 0.

Once the gcd is found, the algorithm is reversed to express it as a linear combination of the two original numbers. This is done by substituting each remainder in the sequence back into the preceding division equation and solving for it in terms of the other numbers. For example, 4 = 82 - 3 . 26 means that 4 can be expressed as a combination of 82 and 26 with coefficients of -3 and 1, respectively. Similarly, 2 = 26 - 6 . 4 means that 2 can be expressed as a combination of 82 and 26 with coefficients of 6 and -19, respectively.

To complete the linear combination, we substitute the expression for 4 into the expression for 2 and simplify:

2 = 26 - 6 . (82 - 3 . 26) = 26 - 6 . 82 + 18 . 26
2 = -474 . 82 + 194 . 26

Therefore, the missing coefficients in the linear combination are -474 for 82 and 194 for 26.

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Dr. Ziglar can see 6 of the 10 patients before lunch in 210 different orders.

The number of different orders in which Dr. Ziglar can see 6 patients before lunch is given by the combination formula, which is:

nCr = n! / (r! x (n-r)!)

where n is the total number of patients in the waiting room (10 in this case) and r is the number of patients Dr. Ziglar will see before lunch (6 in this case).

Substituting the values, we get:

10C6 = 10! / (6! x (10-6)!)

= (10 x 9 x 8 x 7 x 6 x 5) / (6 x 5 x 4 x 3 x 2 x 1)

= 210

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The answer is 210. This is because the number of different orders in which Dr. Ziglar can see 6 of the 10 patients before lunch is given by the formula for combinations, which is:

10! / (6! * 4!)

This simplifies to:

(10 * 9 * 8 * 7) / (4 * 3 * 2 * 1)

Which equals:

210

Therefore, there are 210 different orders in which Dr. Ziglar can see 6 of the patients before lunch.

There are 10 patients in Dr. Ziglar's waiting room, and Dr. Ziglar can see 6 patients before lunch. In how many different orders can Dr. Ziglar see 6 of the patients before lunch? The answer is 5,040 different orders. This can be calculated using the permutation formula: P(n, r) = n! / (n-r)!, where n is the total number of items and r is the number of items to be selected. In this case, n = 10 and r = 6, so P(10, 6) = 10! / (10-6)! = 10! / 4! = 5,040.

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we can predict the amount of time Anika worked on Day 0 by using the y-intercept of the linear model, and we can determine how much her setup time decreased per day by using the slope of the linear model. In this case, Anika worked for 60 minutes on Day 0, and her setup time decreased by approximately 5 minutes per day.

1. Based on the given linear model, we have to predict the amount of time Anika worked on Day 0. To do this, we need to use the y-intercept of the model, which is the point where the line crosses the y-axis. In this case, the y-intercept is at (0, 60). This means that when the day number is 0, the amount of time Anika worked is 60 minutes. Therefore, Anika worked for 60 minutes on Day 0.

2. To determine how much Anika's setup time decreased per day, we need to look at the slope of the linear model. The slope represents the rate of change in the amount of time Anika spent on setup each day. In this case, the slope is -5. This means that for each day, the amount of time Anika spent on setup decreased by 5 minutes. Therefore, her setup time decreased by approximately 5 minutes per day.

In conclusion, we can predict the amount of time Anika worked on Day 0 by using the y-intercept of the linear model, and we can determine how much her setup time decreased per day by using the slope of the linear model.

In this case, Anika worked for 60 minutes on Day 0, and her setup time decreased by approximately 5 minutes per day.

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All lower bounds of 12 and 18 there are four lower bounds in total.

In the poset (d36, |), we have the partial order relation a | b, if a divides b, for all a, b ∈ d36.

To find the lower bounds of 12 and 18, we need to find all the elements in d36 that divide both 12 and 18.

The divisors of 12 are {1, 2, 3, 4, 6, 12}.

The divisors of 18 are {1, 2, 3, 6, 9, 18}.

The common divisors of 12 and 18 are {1, 2, 3, 6}.

Therefore, the lower bounds of 12 and 18 are 1, 2, 3, and 6.

There are four lower bounds in total.

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In the poset (d36, |), where d36 = {1, 2, 3, 4, 6, 9, 12, 18, 36}, we are asked to find all lower bounds of 12 and 18. A lower bound of a set is an element that is less than or equal to all the elements in the set. In this poset, the partial order is defined as | (divisibility), meaning a is less than or equal to b if a divides b.

Thus, a lower bound of 12 and 18 is any number that divides both 12 and 18. The only such number is 1. Therefore, 1 is the only lower bound of 12 and 18. In conclusion, there is only one lower bound for both 12 and 18 in this poset.
In the poset (d36, |), "d36" represents the divisors of 36 and "|" means "divides." The divisors are {1, 2, 3, 4, 6, 9, 12, 18, 36}. To find the lower bounds of 12 and 18, we look for the common divisors of both numbers. The common divisors are {1, 2, 3, 6}, meaning these elements are the lower bounds of 12 and 18 in this poset. There are 4 lower bounds in total.

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To find the limit of (e^x x)^8/x as x approaches infinity, we can use L'Hopital's Rule. First, we take the natural logarithm of both sides of the expression to simplify it:

ln[(e^x x)^8/x] = 8 ln(e^x x) - ln(x)

Using properties of logarithms, we can simplify this expression further:

ln[(e^x x)^8/x] = 8(x + ln(x)) - ln(x)

Taking the limit as x approaches infinity, we get:

lim x→∞ ln[(e^x x)^8/x] = lim x→∞ [8(x + ln(x)) - ln(x)]

= lim x→∞ 8x + 8ln(x) - ln(x)

= lim x→∞ 8x + 7ln(x)

Now, applying L'Hopital's Rule by taking the derivative of the numerator and denominator with respect to x, we get:

lim x→∞ 8 + 7/x = 8

Therefore, the limit of (e^x x)^8/x as x approaches infinity is 8.

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The closest value to the volume of the water tower tank with a spherical tank diameter of 6 meters is 113.04 m3.

The volume of a sphere can be calculated using the formula V = (4/3)π[tex]r^{3}[/tex], where V is the volume and r is the radius of the sphere. In this case, the diameter of the spherical tank is given as 6 meters, so the radius (r) is half of that, which is 3 meters.

Substituting the radius value into the formula, we have V = (4/3)π([tex]3^{3}[/tex]) = (4/3)π(27) ≈ 113.04 m3.

Among the given options, 113.04 m3 is the closest value to the volume of the water tower tank. It represents the approximate amount of water that the tank can hold.

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True. using a larger page size makes page tables larger

Increasing the page size will reduce the number of pages required to store a given amount of memory, but it will also increase the size of the page tables needed to map the virtual addresses to physical addresses. This is because each page table entry will now have to store a larger physical address. As a result, using larger page sizes can improve performance by reducing the number of page faults, but it can also increase the overhead of managing page tables. So, increasing the page size will make the page tables larger.

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Answer:

5

Step-by-step explanation:

5y - 21 = 19 - 3y

Add 3y on both sides

5y + 3y - 21 = 19

8y - 21 = 19

Add 21 on both sides

8y = 19 + 21

8y = 40

Divide 8 on both sides

y = 40/8

y = 5

Answer:

y=5

Step-by-step explanation:

5y - 21 = 19 - 3y

+21. +21

5y=40-3y

+3y +3y

8y=40

divide 40 by 8

40/8=5

The derivative of f(x) is 3x^2 * (1 + x^3^4)^(1/4) - 2x * (1 + x^2^4)^(1/4).

To find the derivative of the function f(x) = ∫[x^2 to x^3] (1 + t^4)^(1/4) dt, we can use the Fundamental Theorem of Calculus and the Chain Rule.

Applying the Fundamental Theorem of Calculus, we have:

f'(x) = (1 + x^3^4)^(1/4) * d/dx(x^3) - (1 + x^2^4)^(1/4) * d/dx(x^2)

Taking the derivatives, we get:

f'(x) = (1 + x^3^4)^(1/4) * 3x^2 - (1 + x^2^4)^(1/4) * 2x

Simplifying further, we have:

f'(x) = 3x^2 * (1 + x^3^4)^(1/4) - 2x * (1 + x^2^4)^(1/4)

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The value of f'(3) is 6g(9)

To find the value of f'(3), we need to use the fundamental theorem of calculus and differentiate f(x) with respect to x.

We have:

[tex]f(x) = ∫[0,x^2] g(t) dt[/tex]

Applying the fundamental theorem of calculus, we get:

[tex]f'(x) = g(x^2) * (d/dx) [x^2][/tex]

[tex]f'(x) = 2xg(x^2)[/tex]

So, at x=3, we have:

f'(3) = 2(3)g(9)

f'(3) = 6g(9)

Therefore, the value of f'(3) is 6g(9).

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Therefore, The probability of event E is 14/19. In decimal form, without rounding, the answer is approximately 0.7368

The probability of event E can be determined by using the odds ratio formula: P(E) = odds in favor of E / (odds in favor of E + odds against E). Plugging in the given values, we get P(E) = 14 / (14 + 5) = 0.7368 or 0.7368.
To determine the probability of event E given the odds in favor of E are 14 to 5, we will follow these steps:
1. Understand the concept of odds in favor: The odds in favor of an event are the ratio of the number of successful outcomes to the number of unsuccessful outcomes.
2. Convert the odds to probability: To find the probability, we will use the formula P(E) = odds in favor of E / (odds in favor of E + odds against E).
Now, let's apply the formula:
P(E) = 14 / (14 + 5)
P(E) = 14 / 19

Therefore, The probability of event E is 14/19. In decimal form, without rounding, the answer is approximately 0.7368.

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Answer: Question nine pattern is times 4 and question 10 pattern is divided by 3

The length is 6 cm, and the width is 2 cm, we can substitute these values into the formula: 363636 = 6 * 2 * h. By simplifying the equation, we find that the height of the box should be 30303 centimeters.

To determine the height of the box, we can use the formula for volume, which is given by the formula V = lwh, where V is the volume, l is the length, w is the width, and h is the height.

In this case, we are given that the volume of the box is 363636 cubic centimeters, the length is 6 cm, and the width is 2 cm. Plugging these values into the formula, we get:

363636 = 6 * 2 * h

To solve for h, we divide both sides of the equation by 12:

h = 363636 / 12

h = 30303 cm

Therefore, the height of the box should be 30303 centimeter.

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To prove that the empty set 0 is not NP-complete, we need to show that 0 is not in NP or that no NP-complete problem can be reduced to 0.

Since 0 is a language that does not contain any strings, it is trivially decidable in constant time. Therefore, 0 is in P but not in NP.

Since no NP-complete problem can be reduced to a problem in P, it follows that 0 is not NP-complete.

(b) To prove that if P=NP, then every language A EP, except A = 0 and A= = *, is NP-complete, we need to show that if P=NP, then every language A EP can be reduced to any NP-complete problem.

Assume P=NP. Let L be an arbitrary language in EP. Since P=NP, there exists a polynomial-time algorithm that decides L. Let A be an NP-complete language. Since A is NP-complete, there exists a polynomial-time reduction from any language in NP to A.

To show that L can be reduced to A, we construct a reduction as follows: given an instance x of L, use the polynomial-time algorithm that decides L to determine whether x is in L. If x is in L, then return a fixed instance y of A. Otherwise, return the empty string.

This reduction takes polynomial time since the algorithm for L runs in polynomial time, and the reduction itself is constant time. Therefore, L is polynomial-time reducible to A.

Since A is NP-complete, any language in NP can be reduced to A. Therefore, if P=NP, then every language in EP can be reduced to any NP-complete problem except 0 and * (which are not in NP).

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Answer:

(2,-1)

Step-by-step explanation:

The relation of divisibility violates the antisymmetry and transitivity properties, it is not a partial order.

In order to prove that the relation of divisibility, denoted by |, is not a partial order, we need to show that it violates at least one of the three properties of a partial order: reflexivity, antisymmetry, and transitivity.

Reflexivity: For any element a in a set, a | a. Therefore, the relation of divisibility is reflexive.

Antisymmetry: If a | b and b | a, then a = b. This property does not hold for the relation of divisibility. For example, 2 | 6 and 3 | 6, but 2 and 3 are not equal.

Transitivity: If a | b and b | c, then a | c. This property also does not hold for the relation of divisibility. For example, 2 | 6 and 6 | 12, but 2 does not divide 12.
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The relation of divisibility, denoted by |, is not a partial order when s = z. To prove this, we need to show that it does not satisfy the three properties of a partial order, namely reflexivity, antisymmetry, and transitivity.

Reflexivity: For any integer n, n|n is true, so the relation is reflexive.
Antisymmetry: If n|m and m|n, then n = m. However, when s = z, there exist non-zero integers that are not equal but still divide each other. For example, 2|(-2) and (-2)|2, but 2 ≠ -2. Thus, the relation is not antisymmetric.
Transitivity: If n|m and m|p, then n|p. This property holds for any integers n, m, and p, regardless of s and z.
Since the relation of divisibility fails to satisfy the property of antisymmetry, it cannot be a partial order when s = z.
The divisibility relation satisfies all three properties, so it is actually a partial order on the set of integers (contrary to the question's assumption).

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Answer:

Step-by-step explanation:

You want the price per ounce and the best deal, given 6-, 10-, and 16-ounce bricks cost $3.59, $4.79, and $7.89.

The unit price is found by dividing the price by the number of units. Here, our unit is 1 ounce, so we divide each price by the number of ounces to find the price per ounce. The calculator display attached shows the result to 4 decimal places. Here, we round to 2 dp.

The lowest price per ounce is obtained with the 10 oz brick.

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The train makes the trip in 2 hours while the car makes the trip in 2 hours. The average speed of the train is 60 miles per hour while the average speed of the car is 60 miles per hour. Therefore, there is no difference in speed between the train and car

The regression model and the data, and I will be able to provide specific calculations and a Plagiarism-free response.

To compute the standard error of the estimate and perform the hypothesis test for B1, we need the regression model and the data. Without that information, it is not possible to provide specific calculations. However, I can explain the general procedure and concepts involved.

Standard error of the estimate (SE): The standard error of the estimate measures the average deviation between the observed values and the predicted values from the regression model. It is typically calculated as the square root of the mean squared error (MSE) or the residual sum of squares divided by the degrees of freedom.

Significance of B1: To test the significance of the coefficient B1, we perform a t-test using the t-distribution. The null hypothesis (H0) is that B1 is equal to zero, and the alternative hypothesis (H1) is that B1 is not equal to zero. We calculate the t-statistic by dividing the estimated coefficient B1 by its standard error. Then, we compare the t-statistic to the critical value from the t-distribution at the desired significance level (5% in this case).

Confidence interval for B1: To construct a confidence interval for B1, we use the t-distribution. The interval is calculated as B1 plus or minus the margin of error, which is the product of the standard error and the critical value from the t-distribution at the desired confidence level (99% in this case).the regression model and the data, and I will be able to provide specific calculations and a plagiarism-free response.

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(a) In order to convert the information on the number of hours parked to a probability distribution, we need to divide the frequency by the sample size (220)

(b) A typical customer is parked for approximately 3.545 hours, and the standard deviation is approximately 1.692 hours.

(c) The mean amount charged is $43.341, and the standard deviation is $38.079.

a-1. To convert the information on the number of hours parked to a probability distribution, we need to divide the frequency by the sample size (220):

Number of Hours Frequency Probability

1 15 0.068

2 36 0.164

3 63 0.286

4 53 0.241

5 94 0.427

6 40 0.182

7 13 0.059

b. To find the mean of the number of hours parked, we need to multiply each number of hours by its corresponding probability, sum these products, and then divide by the sample size:

Mean = (1)(0.068) + (2)(0.164) + (3)(0.286) + (4)(0.241) + (5)(0.427) + (6)(0.182) + (7)(0.059)

= 3.545

To find the standard deviation, we can use the formula:

Standard deviation = sqrt( (1-3.545)^2(0.068) + (2-3.545)^2(0.164) + (3-3.545)^2(0.286) + (4-3.545)^2(0.241) + (5-3.545)^2(0.427) + (6-3.545)^2(0.182) + (7-3.545)^2(0.059) )

= 1.692

Therefore, a typical customer is parked for approximately 3.545 hours, and the standard deviation is approximately 1.692 hours.

c. To find the mean and the standard deviation of the amount charged, we can follow a similar process as in part b:

Mean = (1)(22)(0.068) + (2)(22)(0.164) + (3)(22)(0.286) + (4)(22)(0.241) + (5)(22)(0.427) + (6)(22)(0.182) + (7)(22)(0.059)

= 3.545

To find the standard deviation, we can use the formula:

Standard deviation = sqrt( (22-43.341)^2(0.068) + (44-43.341)^2(0.164) + (66-43.341)^2(0.286) + (88-43.341)^2(0.241) + (110-43.341)^2(0.427) + (132-43.341)^2(0.182) + (154-43.341)^2(0.059) )

= 38.079

Therefore, the mean amount charged is $43.341, and the standard deviation is $38.079.

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To prove that n^2 - 7n + 12 is nonnegative whenever n is an integer with n ≥ 3, we can start by factoring the expression:
n^2 - 7n + 12 = (n - 4)(n - 3) . Since n ≥ 3, both factors in the expression are positive. Therefore, the product of the two factors is also positive.
(n - 4)(n - 3) > 0

We can also use a number line to visualize the solution set for the inequality:
n < 3: (n - 4) < 0, (n - 3) < 0, so the product is positive
n = 3: (n - 4) < 0, (n - 3) = 0, so the product is 0
n > 3: (n - 4) > 0, (n - 3) > 0, so the product is positive
Therefore, n^2 - 7n + 12 is nonnegative whenever n is an integer with n ≥ 3.
Alternatively, we can complete the square to rewrite the expression in a different form:
n^2 - 7n + 12 = (n - 3.5)^2 - 0.25
Since the square of any real number is nonnegative, we have:
(n - 3.5)^2 ≥ 0
Therefore, adding a negative constant (-0.25) to a nonnegative expression ((n - 3.5)^2) still yields a nonnegative result. This confirms that n^2 - 7n + 12 is nonnegative whenever n is an integer with n ≥ 3.

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The exact length of the curve described by the parametric equations x = 8 + 3t², y = 3 + 2t³, for 0 ≤ t ≤ 2, is 2√5 - 2.

To find the exact length of the curve described by the parametric equations, we can use the arc length formula for parametric curves:

L = ∫[a,b] √[(dx/dt)² + (dy/dt)²] dt

Given the parametric equations x = 8 + 3t² and y = 3 + 2t³, we need to find dx/dt and dy/dt and then evaluate the integral over the given range 0 ≤ t ≤ 2.

First, let's find dx/dt:

dx/dt = d/dt (8 + 3t²)

       = 6t

Next, let's find dy/dt:

dy/dt = d/dt (3 + 2t³)

       = 6t²

Now, let's substitute these derivatives into the arc length formula and evaluate the integral:

L = ∫[0,2] √[(6t)² + (6t²)²] dt

  = ∫[0,2] √(36t² + 36t⁴) dt

  = ∫[0,2] √(36t²(1 + t²)) dt

  = ∫[0,2] 6t√(1 + t²) dt

To evaluate this integral, we can use a substitution. Let u = 1 + t², then du = 2t dt. Substituting these values, we get:

L = ∫[0,2] 6t√(1 + t²) dt

  = ∫[1,5] 3√u du

Integrating with respect to u:

L = [2√u] | [1,5]

  = 2√5 - 2√1

  = 2√5 - 2

Therefore, the exact length of the curve described by the parametric equations x = 8 + 3t², y = 3 + 2t³, for 0 ≤ t ≤ 2, is 2√5 - 2.

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The solutions of the equation 2sin(x)cos(2x) - cos(2x) = 0 over the interval 0 < x ≤ π are x = π/4, π/6, 3π/4, 5π/6.

To find the solutions of the equation 2sin(x)cos(2x) - cos(2x) = 0 over the interval 0 < x ≤ π, we can factor out cos(2x) from the equation:

cos(2x)(2sin(x) - 1) = 0

Now we have two possible cases:

Case 1: cos(2x) = 0

To find the solutions of cos(2x) = 0, we can set 2x equal to π/2 or 3π/2, within the given interval:

2x = π/2 or 2x = 3π/2

Solving for x:

x = π/4 or x = 3π/4

Both π/4 and 3π/4 are within the interval 0 < x ≤ π.

Case 2: 2sin(x) - 1 = 0

To find the solutions of 2sin(x) - 1 = 0, we can solve for sin(x):

2sin(x) = 1

sin(x) = 1/2

This equation is satisfied when x equals π/6 or 5π/6 within the given interval:

x = π/6 or x = 5π/6

Both π/6 and 5π/6 are within the interval 0 < x ≤ π.

Therefore, the solutions of the equation 2sin(x)cos(2x) - cos(2x) = 0 over the interval 0 < x ≤ π are:

x = π/4, π/6, 3π/4, 5π/6.

Correct Question :

Find all solutions of the equation 2sin x cos2x-cos2x=0 over the interval 0<x<=pi.

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