Alice, Bob, and Christy are setting up aquariums. The design of each aquarium is below. Alice has enough pebbles to cover 9 square feet. Does she have enough to put a layer of pebbles on the bottom of Aquarium A?

14 vertices in this polyhedron.

Euler's formula, which states that for any polyhedron (a three-dimensional solid object with flat polygonal faces), the number of vertices (V), edges (E), and faces (F) are related by the equation:

V - E + F = 2

This formula is named after the mathematician Leonhard Euler, who first discovered it in the 18th century.

It's a fundamental result in geometry and has many important applications.

The polyhedron has 9 faces and 21 edges.

We can plug these values into Euler's formula and solve for the number of vertices:

V - 21 + 9 = 2

Simplifying the left-hand side, we get:

V - 12 = 2

Adding 12 to both sides, we get:

V = 14

So the polyhedron has 14 vertices.

Euler's formula is a powerful tool for analyzing polyhedra, and can be used to derive many other results in geometry.

It's also related to other important mathematical concepts, such as topology and graph theory.

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We are given that the equation

x^2 y'' - 2xy'^2 y = 0

has a solution y = x, which satisfies the homogeneous equation. To find the general solution of the nonhomogeneous equation

x^2 y'' - 2xy'^2 y = x^2,

we can use the method of undetermined coefficients.

Assume a particular solution of the form y_p(x) = Ax^2 + Bx. Then, we have

y_p'(x) = 2Ax + B,

y_p''(x) = 2A.

Substituting these into the nonhomogeneous equation, we get

x^2 (2A) - 2x(2Ax + B)^2 (Ax^2 + Bx) = x^2.

Simplifying and collecting terms, we get

2A - 2B^2 = 1.

We can choose A = 1/2 and B = -1/2 to satisfy this equation. Therefore, a particular solution of the nonhomogeneous equation is

y_p(x) = (1/2)x^2 - (1/2)x.

The general solution of the nonhomogeneous equation is then

y(x) = c1 x + c2 - (1/2)x + (1/2)x^2,

where c1 and c2 are constants determined by the initial or boundary conditions of the problem.

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The given compound proposition has three sub-propositions connected by logical OR. To construct a truth table, we need to consider all possible combinations of the variables p, q, r, s, t, u, and v. For each combination, we evaluate the truth value of each sub-proposition and then apply logical OR to obtain the final truth value of the compound proposition. Since we have seven variables, each with two possible truth values (true or false), the total number of rows needed in the truth table is 2^7 = 128.

The given compound proposition is (p→r)∨(¬s→¬t)∨(¬u→v). It has three sub-propositions connected by logical OR. To construct a truth table, we need to consider all possible combinations of the variables p, q, r, s, t, u, and v. Since each variable has two possible truth values (true or false), we have 2^7 = 128 possible combinations. For each combination, we evaluate the truth value of each sub-proposition and then apply logical OR to obtain the final truth value of the compound proposition.

To construct a truth table for the given compound proposition, we need 128 rows since we have seven variables, each with two possible truth values. Therefore, the correct answer is (b) 64 is not correct and (c) 34 is too small.

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The CIV of each customer is:
- Amber: 20 - Ashley: 20 - Joe: 20 - Lauren: 30 - Jung: 20 - Maria: 30 - Jose: 30

To calculate the CIV (customer lifetime value) of each customer, we can use the formula provided in the hint for Ashley and then apply the same formula for the rest of the customers:

CIVAshley = [CLVMaria + 0.5CLVJose] + [CIVMaria + 0.5CIVJose]

Plugging in the values given in the table:
CIVAshley = [10 + 0.5(15)] + [10 + 0.5(10)] = 20

Therefore, the CIV of Ashley is 20.

Using the same formula for the other customers:
CIVAmber = [10 + 0.5(15)] + [10 + 0.5(10)] = 20
CIVJoe = [10 + 0.5(15)] + [10 + 0.5(10)] = 20
CIVLauren = [25 + 0.5(10)] + [10 + 0.5(15)] = 30
CIVJung = [10 + 0.5(15)] + [10 + 0.5(10)] = 20
CIVMaria = [10 + 0.5(15)] + [20 + 0.5(10)] = 30
CIVJose = [10 + 0.5(15)] + [20 + 0.5(10)] = 30

Therefore, the CIV of each customer is:
- Amber: 20
- Ashley: 20
- Joe: 20
- Lauren: 30
- Jung: 20
- Maria: 30
- Jose: 30

Note that the CIV represents the total value a customer is expected to bring to a company over the course of their relationship, taking into account the frequency and monetary value of their purchases.

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The series converges absolutely. The ratio test states that if the limit as n approaches infinity of the absolute value of the ratio of the (n+1)th term to the nth term is less than 1, then the series converges absolutely.

If the limit is greater than 1, the series diverges. If the limit is equal to 1, then the test is inconclusive and another test must be used. For the given series 3n/(2n)!, the ratio of successive terms is (3(n+1)/(2(n+1))!) / (3n/(2n)!) = 3(n+1)/(2n+2)(2n+1). Simplifying this gives the ratio as 3/((2n+2)/(n+1)(2n+1)).

Taking the limit as n approaches infinity, we get that the ratio approaches 0. Therefore, the series converges absolutely.

When n=7, the ratio of successive terms is 30/1176, or 5/196.

Taking the limit of this ratio as n approaches infinity, we get that it approaches 0. Therefore, the series converges absolutely.

By the ratio test, we have determined that the series 3n/(2n)! converges.

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To show that a matrix a is diagonalizable, we need to prove that a can be written as a product of two matrices P and D, where P is invertible and D is a diagonal matrix. In other words, we need to show that there exists a basis of eigenvectors for a.

Let λ be an eigenvalue of a with corresponding eigenvector x. Then, we have ax = λx, which can be rewritten as (a - λI)x = 0, where I is the identity matrix. Since x is nonzero, we must have det(a - λI) = 0, which gives us the characteristic equation of a.

Solving for λ in the characteristic equation, we get λ = d ± √(d^2 - 4bc)/(2b), where d is a diagonal entry of a. If (a - d)^2 - 4bc > 0, then both eigenvalues are real and distinct, which means a has a basis of eigenvectors and is diagonalizable.

On the other hand, if (a - d)^2 - 4bc < 0, then the eigenvalues are complex conjugates, which means a cannot be diagonalized over the real numbers. Therefore, a is not diagonalizable.

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Asymptotes are typically found in rational functions (ratios of polynomials) or logarithmic or exponential functions.

An asymptote is a straight line that a curve approaches but never touches.

In other words, it is a line that the function gets closer and closer to but never actually intersects.
Now, let's take a look at the function f(x) = [tex]x^2[/tex]/x.

This function can be simplified to f(x) = x.

Therefore,

The graph of this function is simply a straight line passing through the origin with a slope of 1.
Since the graph of this function is a straight line, it does not have any vertical or horizontal asymptotes.

However, it is worth noting that the function has a hole at x = 0, since the value of the function is undefined at that point.
In summary, the equation of each asymptote for the function f(x) = x^2/x is as follows:
- There is no vertical asymptote.
- There is no horizontal asymptote.

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The equations of the asymptotes for the given function are:

Vertical asymptotes: x1 = 0 and x = 0

Horizontal asymptotes: None

Slant asymptote: y = x.

Since the given function is a rational function, it may have vertical, horizontal, and slant asymptotes.

Vertical Asymptotes:

The vertical asymptotes occur at those values of x where the denominator of the function becomes zero. Here, the denominator is x1x, so the vertical asymptotes are given by x1 = 0 and x = 0.

Horizontal Asymptotes:

To find the horizontal asymptotes, we can compare the degrees of the numerator and the denominator of the function. Here, the degree of the numerator is 2 and the degree of the denominator is 3, so there is no horizontal asymptote.

Slant Asymptotes:

Since the degree of the numerator is less than the degree of the denominator by exactly 1, we can find the slant asymptote by long division of the numerator by the denominator. Performing long division, we get:

x2 x1 x = (x + 0)x1 x - 0

So the slant asymptote is y = x.

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The value of (f ₀ f⁻¹) (5) of the function f(x) = x + 9 is 5.

Given is a function f(x) = x + 9,

Setting x + 9 = y and making x the subject we have

y = x + 9

x = y - 9

replacing x with f⁻¹(x) and y with x we have

f⁻¹(x) = x - 9

so, the (f ₀ f⁻¹) (x) can be gotten by substituting x in f(x) with x - 9 so that we have,

(f ₀ f⁻¹) (x) = (x - 9) + 9

(f ₀ f⁻¹) (x) = x

Therefore,

(f ₀ f⁻¹) (5) = 5

Hence the value of (f ₀ f⁻¹) (5) of the function f(x) = x + 9 is 5.

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a) To find k, we need to integrate f(x, y) over its entire domain and set it equal to 1 since f(x, y) is a valid probability density function. Therefore,

Integral from 0 to 3-x Integral from 0 to 3-x of k dy dx = 1

Integrating with respect to y first, we get

Integral from 0 to 3-x of k(3-x) dy dx = 1

Solving for k, we get

k = 1/[(3/2)^2] = 4/9

b) P(X + Y ≤ 1) can be found by integrating f(x, y) over the region where X + Y ≤ 1. Since f(x, y) is 0 for x + y > 3, this integral can be split into two parts:

Integral from 0 to 1 Integral from 0 to x of f(x, y) dy dx + Integral from 1 to 3 Integral from 0 to 1-x of f(x, y) dy dx

Evaluating this integral, we get

P(X + Y ≤ 1) = Integral from 0 to 1 Integral from 0 to x of (4/9) dy dx + Integral from 1 to 3 Integral from 0 to 1-x of 0 dy dx

             = Integral from 0 to 1 x(4/9) dx

             = 2/9

c) P(X^2 + Y^2 ≤ 1) represents the area of the circle centered at the origin with radius 1. Since f(x, y) is 0 outside the region where x + y < 3, this probability can be found by integrating f(x, y) over the circle of radius 1. Converting to polar coordinates, we get

Integral from 0 to 2π Integral from 0 to 1 of r f(r cosθ, r sinθ) dr dθ

                 = Integral from 0 to π/4 Integral from 0 to 1 of (4/9) r dr dθ + Integral from π/4 to π/2 Integral from 0 to 3-√(2) of (4/9) r dr dθ

                 = Integral from 0 to π/4 (2/9) dθ + Integral from π/4 to π/2 (3-√(2))2/9 dθ

                 = (π/18) + [(6-2√(2))/27]

                 = (2π-12+4√2)/54

d) P(Y > X) can be found by integrating f(x, y) over the region where Y > X. Since f(x, y) is 0 for y > 3 - x, this integral can be split into two parts:

Integral from 0 to 3/2 Integral from x to 3-x of f(x, y) dy dx + Integral from 3/2 to 3 Integral from 3-x to 0 of f(x, y) dy dx

Evaluating this integral, we get

P(Y > X) = Integral from 0 to 3/2 Integral from x to 3-x of (4/9) dy dx + Integral from 3/2 to 3 Integral from 3-x to 0 of 0 dy dx

         = Integral from 0 to 3/2 (8/9)x dx

         = 1/3

e) X and Y are not independent since the probability of Y > X is not equal to the product of

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To find the endpoints of the major and minor axes, we first need to rewrite the equation of the ellipse in standard form:

$$\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1$$

where (h,k) is the center of the ellipse, a is the distance from the center to the endpoints of the major axis, and b is the distance from the center to the endpoints of the minor axis.

Dividing both sides of the given equation by 25, we get:

$$\frac{x^2}{7^2} + \frac{y^2}{5^2} - \frac{8x}{7} - \frac{33}{5^2} = 1$$

Comparing this with the standard form equation, we see that:

- h = 8/7

- k = 0

- a = 7

- b = 5

So the center of the ellipse is (8/7,0), the endpoints of the major axis are (8/7 + 7, 0) = (57/7,0) and (8/7 - 7,0) = (-45/7,0), and the endpoints of the minor axis are (8/7, 5) and (8/7, -5).

Therefore, the endpoints of the major axis are (57/7,0) and (-45/7,0), and the endpoints of the minor axis are (8/7, 5) and (8/7, -5).

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The statement that best describes the size of the cross section is C. The height of the cross section is the same as the height of the prism, and the width of the cross section is the same as the width of the faces of the prism.

If a triangular prism is cut at a right angle to its base, the resulting section will resemble and have the same dimensions as the original triangular base of the prism.

The altitude of the cross-sectional triangle will equal the altitude of the triangular base of the prism. In a similar manner, the width of the triangular shape (its cross-section) will match the width of the base of the prism.

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From the given equation the series diverge is  iii only. The correct answer is B.

First, note that the series in option I is not an alternating series, so we cannot apply the Alternating Series Test to check for convergence.

For option II, we can use the Limit Comparison Test. We compare it to the harmonic series, which is known to diverge:

lim(n→∞) (1 + 1/n) / (1/n) = lim(n→∞) (n + 1) / n = 1

Since the limit is positive and finite, the series in option II diverges.

For option III, we can use the Divergence Test, which states that if the limit of the terms of the series does not approach zero, then the series must diverge.

lim(n→∞) (n + 1/n^2) = ∞

Since the limit is infinite, the series in option III also diverges.

Therefore, the answer is (B) iii only.

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All values of b that prove Stella's claim is not correct by making the rate of change of function B greater than the rate of change of function A are:

D. 15

E. 17

In Mathematics and Geometry, the rate of change (slope) of any straight line can be determined by using this mathematical equation;

Rate of change = (Change in y-axis, Δy)/(Change in x-axis, Δx)

Rate of change = rise/run

Rate of change = (y₂ - y₁)/(x₂ - x₁)

When b = 6, the rate of change of function B is given by:

Rate of change = (6 - 3)/(4 - 1)

Rate of change = 3/3

Rate of change = 1 (not greater than 3).

When b = 12, the rate of change of function B is given by:

Rate of change = (12 - 3)/(4 - 1)

Rate of change = 9/3

Rate of change = 3 (not greater than 3).

When b = 15, the rate of change of function B is given by:

Rate of change = (15 - 3)/(4 - 1)

Rate of change = 12/3

Rate of change = 4 (greater than 3).

When b = 15, the rate of change of function B is given by:

Rate of change = (17 - 3)/(4 - 1)

Rate of change = 14/3

Rate of change = 4.7 (greater than 3).

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Missing information:

Select all values of b that prove Stella's claim is not correct by making the rate of change of function B greater than the rate of change of function A.

6

8

12

15

17

The answer is option D: 0.375.

To find the probability P(8 < x < 9.5), we need to find the area under the probability density function of the uniform distribution between x = 8 and x = 9.5. Since the uniform distribution is constant between 7 and 11, the probability density function is given by:

f(x) = 1/(11-7) = 1/4

So, the probability P(8 < x < 9.5) is:

P(8 < x < 9.5) = ∫f(x) dx from 8 to 9.5

= ∫(1/4) dx from 8 to 9.5

= (1/4) * (9.5 - 8)

= 0.375

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Here is a sketch of the region:

         |                  /

         |                /

         |              /

         |            /

         |          /

         |        /

         |      /

         |    /

         |  /

         |/

-----------------------

         |\

         |  \

         |    \

         |      \

         |        \

         |          \

         |            \

         |              \

         |                \

         |                  \

The shaded region is the area between the two hyperbolas.

To sketch and shade the region in the xy-plane defined by the inequality [tex]x^2 y^2 < 25,[/tex] we first need to find the boundary of the region, which is given by[tex]x^2 y^2 = 25.[/tex]

Taking the square root of both sides of the equation, we get:

xy = ±5

This equation represents two hyperbolas in the xy-plane, one opening up and to the right, and the other opening down and to the left.

To sketch the region, we start by drawing the two hyperbolas.

Then, we shade the region between the hyperbolas, which corresponds to the solutions of the inequality [tex]x^2 y^2 < 25.[/tex]

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The shaded region represents the set of all points (x, y) in the xy-plane where the product of the squares of x and y is less than 25.

To sketch and shade the region in the xy-plane defined by the inequality x^2 y^2<25, we can start by recognizing that this inequality defines the area within a circle centered at the origin with radius 5.

To begin, we can draw the coordinate axes (x and y) and mark the origin (0,0) as the center of our circle. Next, we can draw a circle with radius 5, making sure to include all points on the circumference of the circle.

Finally, we need to shade in the region inside the circle, which satisfies the inequality x^2 y^2<25. This means that any point within the circle that is not on the circle itself satisfies the inequality. We can shade in the region inside the circle, excluding the points on the circumference of the circle, to indicate the solution to the inequality.

In summary, to sketch and shade the region in the xy-plane defined by the inequality x^2 y^2<25, we draw a circle with center at the origin and radius 5, and then shade in the region inside the circle, excluding the points on the circumference.

To sketch and shade the region in the xy-plane defined by the inequality x^2 y^2 < 25, follow these steps:

1. Rewrite the inequality as (x^2)(y^2) < 25.
2. Recognize that this inequality represents the product of the squares of x and y being less than 25.
3. To help visualize the region, consider the boundary case when (x^2)(y^2) = 25. This boundary is an implicit equation that defines a rectangle with vertices at (-5, -1), (-5, 1), (5, -1), and (5, 1).
4. Shade the region inside this rectangle but excluding the boundary, as the inequality is strictly less than 25.

The shaded region represents the set of all points (x, y) in the xy-plane where the product of the squares of x and y is less than 25.

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1. False   2. False    3. False

4. The distance between the shark and the bird is |1834 – 145| = 12634 feet.  False

To determine the truth value of each statement, we need to calculate the absolute differences between the given coordinates.

1: The distance between the fish and the dolphin is |–3812 – (–8414)| = |3812 + 8414| = 12226 feet.

Since the calculated distance is 12226 feet, the statement "The distance between the fish and the dolphin is 4534 feet" is false.

2: The distance between the shark and the dolphin is |–145 – 8414| = |-145 - 8414| = 8559 feet.

Since the calculated distance is 8559 feet, the statement "The distance between the shark and the dolphin is 22934 feet" is false.

3: The distance between the fish and the bird is |1834 – (–3812)| = |1834 + 3812| = 5646 feet.

Since the calculated distance is 5646 feet, the statement "The distance between the fish and the bird is 5714 feet" is false.

4: The distance between the shark and the bird is |1834 – 145| = |1834 - 145| = 1689 feet.

Since the calculated distance is 1689 feet, the statement "The distance between the shark and the bird is 12634 feet" is false.

Therefore:

False

False

False

False

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The critical t-values are approximately ±4.032.

To determine the statistically significant values of the t statistic at the α = 0.001 level, with a sample size of 6 and a two-tailed test, refer to a t-distribution table.

To test H0: μ = 0 against Ha: μ ≠ 0 with an SRS of 6 observations from a normal population, follow these steps:

1. Determine the degrees of freedom (df): Since n = 6, the df = n - 1 = 5.
2. Identify the significance level (α): In this case, α = 0.001.
3. Determine the type of test: As Ha: μ ≠ 0, this is a two-tailed test.
4. Refer to a t-distribution table: Look up the critical t-values for a two-tailed test with df = 5 and α = 0.001.
5. Find the critical t-values: The table will show that the critical t-values are approximately ±4.032.

Therefore, t statistic values less than -4.032 or greater than 4.032 are statistically significant at the α = 0.001 level.

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This year a grocery store is paying the manager a salary of $48,680 per year. The percent change in the manager's salary from last year to this year is approximately 7.41%.

To find the percent change in the manager's salary, we can use the percent change formula:

Percent Change = ((New Value - Old Value) / Old Value) * 100

Given that last year's salary was $45,310 and this year's salary is $48,680, we can substitute these values into the formula:

Percent Change = (($48,680 - $45,310) / $45,310) * 100

Calculating this expression, we get:

Percent Change = ($3,370 / $45,310) * 100 ≈ 0.0741 * 100 ≈ 7.41%

Therefore, the percent change in the manager's salary from last year to this year is approximately 7.41%. This indicates an increase in salary.

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The point of intersection between the circle of centers and the line of motion is the instantaneous center of rotation.

Here is the diagram of the given problem:

A

   o

   |

   |

   |

   |       B

   o-------o

         / C

        /

       /

Here is the diagram of the given problem:

Copy code

   A

   o

   |

   |

   |

   |       B

   o-------o

         / C

        /

       /

We will first find the velocity of point B using the method of instantaneous centers:

Draw a perpendicular line from point A to the direction of motion of point C. Let's call the intersection point D.

Draw a line from point B to point D. This line represents the velocity of point B.

Draw a line from point C to point D. This line represents the velocity of point C.

The velocity of point B is perpendicular to the line from B to D, so we can draw a perpendicular line from point D to the shaft. Let's call the intersection point E.

Draw a circle centered at point E that passes through point A. This is the circle of centers.

Draw a line from point A to point C. This is the line of motion.

The point of intersection between the circle of centers and the line of motion is the instantaneous center of rotation. Let's call this point F.

Draw a line from point F to point B. This line represents the velocity of point B.

Measure the length of the line from F to B. This is the velocity of point B.

Applying this method, we get the following diagram:

      F

          o

        / |

       /  |

  350 /   | 450

     /    |

    /     |

   /      | C

  o-------o

  A       |

          |

          |

          |

          |

          o B

          500

Draw a perpendicular line from A to the line of motion of point C. Let's call the intersection point D.

Draw a line from B to D. This line represents the velocity of point B.

Draw a line from C to D. This line represents the velocity of point C.

Draw a perpendicular line from D to the shaft. Let's call the intersection point E.

Draw a circle centered at E that passes through A. This is the circle of centers.

Draw a line from A to C. This is the line of motion.

The point of intersection between the circle of centers and the line of motion is the instantaneous center of rotation. Let's call this point F.

Draw a line from F to B. This line represents the velocity of point B.

Measure the length of the line from F to B. This is the velocity of point B.

In this case, the velocity of point B is given by the distance from F to B. From the diagram, we can see that this distance is approximately 64.5 mm directed at an angle of approximately 53.1 degrees from the horizontal.

Next, we will find the angular velocity of link AB using the method of instantaneous centers:

Draw a perpendicular line from A to the line of motion of point C. Let's call the intersection point D.

Draw a line from B to D. This line represents the velocity of point B.

Draw a line from C to D. This line represents the velocity of point C.

Draw a perpendicular line from D to the shaft. Let's call the intersection point E.

Draw a circle centered at E that passes through A. This is the circle of centers.

Draw a line from A to C. This is the line of motion.

Let's call this point F.

Draw

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Number of significant digits is -169.

In the given expression, 320.72 is subtracted by the result of dividing 6109.7 by 3.4.

To express the answer with the appropriate number of significant digits, we must consider the significant digits in each component of the calculation.

Starting with the division, 6109.7 divided by 3.4 yields approximately 1799.9117647058824.

Since 3.4 has two significant digits, the division result should also have two significant digits. Therefore, we round it to 1800.

Subtracting 1800 from 320.72 gives us -1479.28. However, since 320.72 has five significant digits, the final answer should have the same number of significant digits.

Rounding to the appropriate number of significant digits, we obtain -169.

Therefore, the result of the given expression, rounded to the appropriate number of significant digits, is -169.

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To express 1 as a power with the base 6, we can use logarithms.

We have the equation:

[tex]36 = 6^2[/tex]

Taking the logarithm base 6 of both sides:

[tex]\log_6(36) = \log_6(6^2)[/tex]

Applying the logarithmic property, we can bring down the exponent:

[tex]\log_6(36) = 2\log_6(6)[/tex]

Since [tex]\log_b(b) = 1[/tex], where b is the base of the logarithm, we have:

[tex]\log_6(36) = 2 \times 1[/tex]

Simplifying the expression:

[tex]\log_6(36) = 2[/tex]

Therefore, 1 expressed as a power with the base 6 is [tex]6^0[/tex].

The statistical values of the data given are :

Given the data : 6, 6, 7, 10, 10, 10, 11, 13, 13, 16, 16, 18, 18, 18 6,6,7,10,10,10,11,13,13,16,16,18,18,18

The statistical values in the data can be calculated thus:

Sort values in a sending order : 6,6,6,6,7,7,10,10,10,10,10,10,11,11,13,13,13,13,16,16,16,16,18,18,18,18,18,18

Minimum = 6 (least value)

Maximum= 18 (highest value)

Median = (N+1)/2 th term

Median = (11 + 13)/2 = 12

First quartile: 1/4(N+1)th term

First quartile = 10

Third quartile = 3/4(N+1)th term

Third quartile = 16

Interquartile Range: (Third Quartile - First quartile)

Interquartile range = 16-10 = 6

Therefore, the statistical values of a box and whisker plot are those calculated above .

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Lerato spends 2 hours 30 minutes talking to her relatives during on the month of April.

The cost is 90 cents per minute, so first we need to convert the total time Lerato spent on phone calls to minutes.To do that, we can use the following calculation:2 hours 30 minutes = 2 × 60 + 30 = 150 minutesNow,

we can multiply the total minutes by the cost per minute:$150 \text{ minutes} \times 90 \text{ cents/minute} = 13500 \text{ cents} $

But we need to convert cents to Rand, so we divide by 100 (since there are 100[tex]$150 \text{ minutes} \times 90 \text{ cents/minute} = 13500 \text{ cents} $[/tex] cents in one Rand):$13500 \text{ cents} ÷ 100 = 135 \text{ Rand}$

Therefore,

Lerato spent 135 Rand talking to her relatives during the month of April.

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The origin traversed counterclockwise is ∮c xdx + ydy / x² + y² = 2πi

This is a classic example of a line integral in complex analysis.

To evaluate this integral, we need to use the Cauchy Integral Formula, which states that if f(z) is analytic inside and on a simple closed contour C, then:

∮C f(z) dz = 2πi Res(f, z)

Res(f, z) denotes the residue of f at z.

In this case, we have f(z) = x + iy / x² + y², and we want to integrate over a Jordan curve C that encloses the origin.

Since f(z) is analytic everywhere except at z = 0, we can apply the Cauchy Integral Formula to compute the value of the integral.

To do so, we need to find the residue of f(z) at z = 0.

We can do this by computing the Laurent series expansion of f(z) around z = 0:

f(z) = (x + iy) / (x² + y²) = (1 / z) [(x / z) + (iy / z)] = (1 / z) [1 - (1 / 2) z² + ...]

The coefficient of the z⁻¹ term is 1, which means that the residue of f(z) at z = 0 is 1.

The Cauchy Integral Formula to evaluate the integral:

∮C xdx + ydy / x² + y² = 2πi Res(f, z) = 2πi

The value of the integral is 2πi.

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The value of the line integral is zero for any Jordan curve c whose interior does not contain the origin, traversed counterclockwise.

This integral can be evaluated using Green's Theorem, which states that the line integral of a vector field around a simple closed curve is equal to the double integral of the curl of the vector field over the region enclosed by the curve.

Let F(x, y) = (x/(x^2 + y^2), y/(x^2 + y^2)) be the vector field in question. Then the curl of F is given by:

curl(F) = (∂y/∂x - ∂x/∂y) = (0 - 0)i - (0 - 0)j + (x^2 + y^2)^(-2) (1 - 1)k = 0i + 0j + 0k

Since the curl of F is zero, we know that F is a conservative vector field, which implies that the line integral of F around any closed curve is zero.

Therefore, we have:

∮c xd + yd / ^2 + ^2 = ∮c F · dr = 0

where the last step follows from the fact that F is conservative.

Hence, the value of the line integral is zero for any Jordan curve c whose interior does not contain the origin, traversed counterclockwise.

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The mean number of boxes ordered per month is approximately 29.75 boxes.

Mean number of boxes = (Total number of boxes ordered in the first three months + Total number of boxes ordered for the rest of the year) / Total number of months

The total number of boxes ordered in the first three months would be 35 boxes/month * 3 months = 105 boxes.

For the rest of the year, the number of boxes ordered is reduced to 28 per month. Since there are 12 months in a year, the total number of boxes ordered for the rest of the year would be 28 boxes/month * 9 months = 252 boxes.

Mean number of boxes = (105 boxes + 252 boxes) / 12 months

Mean number of boxes = 357 boxes / 12 months

Mean number of boxes = 29.75 boxes/month

Therefore, the mean number of boxes ordered per month is approximately 29.75 boxes.

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For the relations of the set:

To determine whether each relation on the set {1, 2, 3, 4} is reflexive, symmetric, or asymmetric, we need to analyze the properties of each relation.

  - Reflexive: Yes, every element is related to itself.

  - Symmetric: Yes, every pair is symmetric since (a, b) implies (b, a) for all elements in the relation.

  - Asymmetric: No, it cannot be asymmetric since it is reflexive and, by definition, an asymmetric relation cannot be reflexive.

  - Reflexive: No, not every element is related to itself (e.g., (1, 1) is missing).

  - Symmetric: No, it is not symmetric since (a, b) does not imply (b, a) for all elements in the relation.

  - Asymmetric: Yes, it is asymmetric since (a, b) implies (b, a) is not present for any pair in the relation.

  - Reflexive: Yes, every element is related to itself.

  - Symmetric: Yes, it is symmetric since (a, b) implies (b, a) for all elements in the relation.

  - Asymmetric: No, it cannot be asymmetric since it is reflexive and symmetric.

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After enlarging triangle ABC with a scale factor of 3 about the origin (0, 0), the coordinates of A' and B' are (12, 0).

To find the coordinates of A' and B' after the enlargement, we can use the formula for enlarging a point (x, y) by a scale factor of k about a center point (h, k):

A' = (k * (A - O)) + O

B' = (k * (B - O)) + O

Given that AB = 4 cm and the scale factor is 3, we can assume that point O is the origin (0, 0).

Let's calculate A'

A' = (3 * (A - O)) + O

= 3 * (A - O) + O

= 3 * (4, 0) + (0, 0)

= (12, 0) + (0, 0)

= (12, 0)

Therefore, A' has the coordinates (12, 0).

Now let's calculate B'

B' = (3 * (B - O)) + O

= 3 * (B - O) + O

= 3 * (4, 0) + (0, 0)

= (12, 0) + (0, 0)

= (12, 0)

Therefore, B' also has the coordinates (12, 0).

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--The given question is incomplete, the complete question is given below " A triangle ABC is enlarged, about the point O as centre of enlargement, and the scale factor is 3. Find A'B', if AB = 4cm."--

The surface area of the given pyramid, can be found to be A. 648 square units.

First find the area of the square base :

= 12 x 12

= 144 square units

Then find the area of a single triangular face of the regular pyramid :

= 1 / 2 x base  x height

= 1 / 2 x 12 x 21

= 126 square units

Seeing as there are 4 triangular faces, the total area would then be:

= 144 + ( 126 x 4 triangular faces )

= 648 square units

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Each bag would contain approximately 5.625 lbs of rice.

If you have 45 lbs of rice and 8 bags, then you can calculate how much rice would go in each bag by dividing the total amount of rice by the number of bags. Here's how to do it:1. Convert the weight of rice to ounces. There are 16 ounces in 1 pound, so 45 lbs of rice is equal to 720 ounces.2. Divide the total amount of rice by the number of bags. 720 ounces ÷ 8 bags = 90 ounces per bag.So each bag would contain 90 ounces of rice.

To convert this to pounds, you would divide by 16: 90 ounces ÷ 16 = 5.625 lbs per bag. Therefore, each bag would contain approximately 5.625 lbs of rice.Keep in mind that the weight of rice in each bag may not be exact due to slight variations in weight and the way the rice is packed.

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The power booster can be operated by engine vacuum or through hydraulic pressure, which is usually generated by the power steering pump or an electric-driven pump.

Therefore, the terms "hydraulic pressure" and "power steering pump" are relevant to the operation of the power booster.The power booster, also known as the brake booster, is a device that helps in applying more force to the brakes with less pressure on the brake pedal. This results in an enhanced braking performance. The power booster can be operated using either of two methods:

Engine vacuum, or Hydraulic pressure, which is produced by the power steering pump or an electric-driven pump.

In both methods, the power booster serves to augment the force that is applied to the brake master cylinder.

This increases the hydraulic pressure that is applied to the brakes, resulting in an enhanced braking performance.

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