Find the minimum or maximum value of y=x^2-6x+13

2x - 6  is polynomial represents the length of the triangle's base .

What does a triangular response mean?

It has three straight sides and is a two-dimensional figure. As a 3-sided polygon, a triangle is included. Three triangle angles added together equal 180 degrees.

                             Three edges and three vertices make up the three sides of a triangle, which is a three-sided polygon. The fact that the interior angles of a triangle add up to 180 degrees is the most crucial aspect of triangles.

Area = 1/2 * b * h

x² + 3x— 18  = 1/2 * b * (x + 6)

  b =  2(x² + 3x— 18)/  (x + 6)

         b = 2x² + 6x - 36/x + 6

          b  = 2x - 6

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The choice B is correct. Parallel to one another, both lines have the same slope of 5/3. They do not cross each other and do not share a point.

The slopes of the two lines can be used to figure out how they relate to one another. The formula for determining the slope of line m is as follows:

slope = (y2 - y1)/(x2 - x1)

Where (x1, y1) and (x2, y2) are any two focuses on the line. We obtain the following results by replacing (x1, y1) and (x2, y2) with the respective coordinates (5, 1) and (8, 6).

slope(m )= (6 - 1)/(8 - 5) = 5/3

Similarly, the slope of line n can be found using the coordinates (-4, 3) and (-1, 8):

slope_n = (8 - 3)/(-1 - (-4)) = 5/3

Since both lines have the same slope of 5/3, they are parallel to each other. They do not intersect and have no common point.

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(Walking blindfolded on a tight rope!) When using Euler's method, we need to draw the tangent line at each step in order to see where we will be walking during this step. This statement is True

When using Euler's method, we need to draw the tangent line at each step in order to see where we will be walking during this step. This is because Euler's method is based on the idea of approximating the solution to an ODE by walking along tangent lines of nearby solutions for short periods of time.

At each time step, we first calculate the slope of the tangent line to the solution at that point. This slope is then used to estimate the change in the solution over a small time step. We take a small step along the tangent line using this estimate to get a new point on the solution curve.

To visualize this process, we can draw the tangent line at each point and take a small step along it to see where the solution curve will be at the next time step. This is like walking along a tightrope while blindfolded - we need to be able to feel our way along the rope by sensing the slope of the rope at each step.

In summary, drawing the tangent line at each step is an essential part of using Euler's method to approximate solutions to ODEs. It allows us to visualize the approximation process and see where we will be walking on the solution curve at each time step.

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1) The upper sum for the function f =1/x is 2.083

2) The lower  sum for the function f = 1/x is 0.9708

To approximate the area under the curve f = 1/x on the interval (1, 5), we will use a Riemann sum with n = 4 rectangles.

The width of each rectangle will be Δx = (5 - 1) / 4 = 1.

The height of each rectangle will be the maximum value of f in its interval, which occurs at the left endpoint of each interval

f(1) = 1/1 = 1

f(2) = 1/2

f(3) = 1/3

f(4) = 1/4

Therefore, the area of each rectangle will be:

A = Δx × f(left endpoint) = 1 × f(left endpoint)

The upper sum is the sum of the areas of the rectangles whose heights are greater than or equal to the function values over the interval:

Upper sum = A(1) + A(2) + A(3) + A(4)

= 1 + 1/2 + 1/3 + 1/4

= 2.083

The height of each rectangle will be the minimum value of f in its interval, which occurs at the right endpoint of each interval

f(2) = 1/2

f(3) = 1/3

f(4) = 1/4

f(5) = 1/5

Therefore, the area of each rectangle will be:

A = Δx × f(right endpoint) = 1 × f(right endpoint)

The lower sum is the sum of the areas of the rectangles whose heights are less than or equal to the function values over the interval

Lower sum = A(1) + A(2) + A(3) + A(4)

= 1/2 + 1/3 + 1/4 + 1/5

= 0.9708

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The given question is incomplete, the complete question is:

Approximate the area under the curve f = 1/x on (1,5) by first setting up the 1) Upper sum and the 2) Lower sum Let the number of rectangles n=4. Your answer must be an integer or a fractional form.

The equation of the tangent line at x=3 is y = -7x + 18.

To find the equation of the tangent line at x=3, we first need to find the slope of the tangent line at that point.

The slope of the tangent line at a point on a curve is equal to the derivative of the curve at that point.

So, we need to find the derivative of f(x) and evaluate it at x=3.

f(x) = -2x² + 5x

f'(x) = -4x + 5

f'(3) = -4(3) + 5 = -7

Therefore, the slope of the tangent line at x = 3 is -7.

To find the equation of the tangent line, we can use the point-slope form of a line, which is:

y - y1 = m(x - x1)

where m is the slope of the line, and (x1, y1) is a point on the line.

We know the slope (m=-7) and the point (3, f(3)) on the tangent line, so we can plug these values into the equation and simplify:

y - f(3) = -7(x - 3)

y - (-2(3)² + 5(3)) = -7(x - 3)

y + 3 = -7x + 21

y = -7x + 18.

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The test statistic t0 for this sample with n = 15, = 7, s = 0.8, and ifH1: µ < 6.0 is 4.854.

To find the test statistic t0, we first need to calculate the standard error of the sample mean. This can be done using the formula:

SE = s / √(n)

Where s is the sample standard deviation, n is the sample size. Substituting the given values, we get:

SE = 0.8 / √(15) = 0.206

Next, we can calculate the test statistic using the formula:

t0 = (x - µ) / SE

Where x is the sample mean, µ is the hypothesized population mean (from H1). Substituting the given values, we get:

t0 = (7 - 6) / 0.206 = 4.854

Rounding to three decimal places, we get:

t0 = 4.854

Therefore, the test statistic t0 for this sample with n = 15, = 7, s = 0.8, and ifH1: µ < 6.0 is 4.854.

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The 95% confidence interval for the population standard deviation is approximately between $1.006 and $1.611.

To construct a 95% confidence interval for the population standard deviation, we'll use the Chi-Square distribution and the following formula:

CI = √((n - 1) × s² / χ²)

Where:
CI = Confidence interval
n = Sample size (22 CDs)
s² = Sample variance (standard deviation squared, $1.25²)
χ² = Chi-Square values for given confidence level and degrees of freedom (df = n - 1)

For a 95% confidence interval and 21 degrees of freedom (22 - 1), the Chi-Square values are:
Lower χ² = 10.283
Upper χ² = 33.924

Now, we'll calculate the confidence interval:

Lower limit = √((21 × 1.25²) / 33.924) ≈ 1.006
Upper limit = √((21 × 1.25²) / 10.283) ≈ 1.611

So, the 95% confidence interval for the population standard deviation is approximately between $1.006 and $1.611.

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The mean score on the rescored exam is 75.5 points.

To find the mean of the rescored exam, we need to add 8 points to each student's score and then find the new mean.

To do this, we can use the formula:

New Mean = (Sum of Rescored Scores) / Number of Students

We know that there are 32 students and the original mean score was 67.2 points.

So the sum of the original scores is:

Sum of Original Scores = Mean x Number of Students
= 67.2 x 32
= 2144.

To find the sum of the rescored scores, we need to add 8 points to each student's score:

Sum of Rescored Scores = Sum of Original Scores + (8 x Number of Students)
= 2144 + (8 x 32)
= 2416.

Now we can find the new mean:

New Mean = Sum of Rescored Scores / Number of Students
= 2416 / 32
= 75.5.

Therefore, the mean score on the rescored exam is 75.5 points.

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Answer:

8cm!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Rounding up to the nearest whole number, the sample size used in the study was 53.

We know that the margin of error for a 90% confidence interval is given by:

ME = z* (sigma/sqrt(n))

where z* is the z-score corresponding to the confidence level (90% in this case), sigma is the population standard deviation (unknown in this case), and n is the sample size.

The width of the confidence interval is given by:

width = 2*ME = 159 - 153 = 6

We can find the z-score corresponding to a 90% confidence level using a standard normal distribution table or calculator. The value is approximately 1.645.

Substituting the known values into the margin of error equation, we get:

6/2 = 1.645* (13/sqrt(n))

Solving for n, we get:

n = (1.645*13/3)^2

n ≈ 52.93

Rounding up to the nearest whole number, the sample size used in the study was 53.

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The estimated sales for the coffee shop in 2007 is approximately $13,202.02 million, and for 2016, it's approximately $ 125,234.91 million.

A function that contains the variable inside of the exponent is called an exponential function. We can evaluate such a function by substituting in a value for a variable, just like any other function.

To estimate the sales for the coffee shop in 2007 and 2016, we first need to find the values of t for those years. Since t = 6 corresponds to 1996, we can calculate the values for 2007 and 2016 as follows:

2007: t = 6 + (2007 - 1996) = 6 + 11 = 17

2016: t = 6 + (2016 - 1996) = 6 + 20 = 26

Now, we can plug these values of t into the exponential function

[tex]S(t) = 188.38(1.284)^t[/tex] to estimate the sales.

For 2007:

[tex]S(17) = 188.38(1.284)^1^7[/tex]≈ 13,202.02

For 2016:

[tex]S(26) = 188.38(1.284)^2^6[/tex] ≈ 125,234.91

So, the estimated sales for the coffee shop in 2007 is approximately $13,202.02 million, and for 2016, it's approximately $ 125,234.91 million.

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The first four non-zero terms of the Taylor series of cos(30) centered at a = m/1 are 1, -225/2!, 0, and 0.

To find the Taylor series of cos(30) centered at a = m/1, we need to find the derivatives of cos(x) at x = a, evaluate them at a = m/1, and then use those values to construct the Taylor series.

First, we find the derivatives of cos(x):

cos(x) → -sin(x) → -cos(x) → sin(x) → cos(x) → -sin(x) → -cos(x) → sin(x) → ...

The pattern of derivatives repeats every fourth derivative.

Next, we evaluate the derivatives at a = m/1, where m is some constant:

cos(m/1) → -sin(m/1) → -cos(m/1) → sin(m/1) → cos(m/1) → -sin(m/1) → -cos(m/1) → sin(m/1) → ...

Now we can construct the Taylor series:

[tex]cos(x) = cos(m/1) - (x - m/1)sin(m/1) - (x - m/1)^2cos(m/1)/2! + (x - m/1)^3sin(m/1)/3! + ...[/tex]

To find the first four non-zero terms, we plug in x = 30 degrees and m = 0 (which centers the series at x = 0):

[tex]cos(30) = cos(0) - (30 - 0)sin(0) - (30 - 0)^2cos(0)/2! + (30 - 0)^3sin(0)/3! + ...[/tex]

Simplifying, we get:

cos(30) = [tex]1 - 0 - (30)^2/2! + 0 + ...[/tex]

cos(30) = 1 - 450/2 + 0 + ...

cos(30) = 1 - 225

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The quantity that will give maximum profit is 8.04 hundred units and the maximum profit is  $15964.9

To find the quantity that will give maximum profit, we need to first write down the profit function.

The profit function is given by the difference between the revenue function and the cost function:

P(x) = R(x) - C(x)

where R(x) is the revenue function and C(x) is the cost function.

The revenue function is given by the product of the price and quantity:

R(x) = p(x) × x

= (2012 - (1/3)x²) × x

Substituting the given expressions for p(x) and C(x), we get:

P(x) = (2012 - (1/3)x²) × x - (1000 + 24x + x^2)

Expanding and simplifying, we get:

P(x) = (671x - (1/3)x³) - 1000 - 24x - x²

P(x) = -(1/3)x³ + 647x - 1000

P'(x) = -x² + 647 = 0

Solving for x, we get:

x² = 647

x = ± √647

Since x is in hundreds of units, we need to divide the value of x by 100 to get the answer in units.

x = √647/ 100

x = 8.04 hundred units.

To find the maximum profit, we substitute the value of x into the profit function P(x):

P(x) = -(1/3)x³ + 647x - 1000

P( √647/ 100) = -(1/3)(√647/ 100)³ + 647√647/ 100 - 1000

P( √647/ 100) = $15964.99

Therefore, the quantity that will give maximum profit is 8.04 hundred units and the maximum profit is  $15964.9

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The monthly demand function for a product sold by a monopoly is p = 2012 - 1/3 x^2 dollars, and the average cost is C = 1000 + 24x + x^2 dollars. Production is limited to 1000 units and x is in hundreds of units.

(a) Find the quantity (in hundreds of units) that will give maximum profit ___hundred units

(b) Find the maximum profit. (Round your answer to the nearest cent.)

The equation of the tangent plane to the surface z = 36/4x+5y

at the point (4,4,1) is z = (-9/16)x - (9/20)y + 61/20.

We need to find the partial derivatives of the surface with respect to x

and y, evaluated at the point (4,4):

∂z/∂x = -36/16[tex]x^2[/tex] = -9/[tex]x^2[/tex]

∂z/∂y = -36/5[tex]y^2[/tex]

Evaluating at (4,4), we get:

∂z/∂x(4,4) = -9/16

∂z/∂y(4,4) = -36/80 = -9/20

The equation of the tangent plane is given by:

z - z0 = ∂z/∂x(x0,y0)(x - x0) + ∂z/∂y(x0,y0)(y - y0)

where (x0,y0,z0) is the point of tangency, which is (4,4,1).

Substituting the values we obtained, we get:

z - 1 = (-9/16)(x - 4) + (-9/20)(y - 4)

Simplifying, we get:

z = (-9/16)x - (9/20)y + 61/20

Therefore, the equation of the tangent plane to the surface z = 36/4x+5y

at the point (4,4,1) is z = (-9/16)x - (9/20)y + 61/20.

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The value of the line integral is [tex]\pi .[/tex]

We want to calculate the line integral of the vector field F(x, y, z) = <0, 2, z> over the curve C given by C(t) = (cos(t), sin(t), t),

where 0 <= t <= pi.

First, we need to parameterize F along C by replacing x, y, and z with their expressions in terms of t:

F(C(t)) = F(cos(t), sin(t), t) = <0, 2, t>

Next, we need to calculate the derivative of C with respect to t:

C'(t) = (-sin(t), cos(t), 1)

We can now set up the line integral:

∫C F · dr = ∫[0, pi] F(C(t)) · C'(t) dt

= ∫[0, pi] <0, 2, t> · (-sin(t), cos(t), 1) dt

= ∫[0, pi] (2cos(t) - tsin(t)) dt

= [2sin(t) + tcos(t)]|[0,pi]

= 2sin(pi) + picos(pi) - 2sin(0) - 0cos(0)

[tex]= \pi .[/tex]

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There are 24 different ways to arrange the cards in the boxes.

How to arrange the card in the box?

Because there are four boxes and four cards, there are four ways to arrange the first card, three ways to arrange the second card (because one box is already occupied), two ways to arrange the third card, and one method to arrange the fourth card. As a result, the total number of possible ways to arrange the cards in the boxes is:

4 x 3 x 2 x 1 = 24

So there are 24 different ways to arrange the cards in the boxes.

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The general indefinite integral of ∫(√x³+³√x²)dx is [tex]2(x^{5/2} )/5 + 3(x^{5/3} )/5[/tex] + c , where c is an arbitrary constant.

Integral calculus is the branch of calculus that deals with integrals and its properties. Integration is also known as anti derivative.

An indefinite integral does not consist of any upper or lower limit and hence is indefinite in nature.

We can calculate the general indefinite integral,

∫(√x³+³√x²)dx

Rewriting the integral using power rule we get,

∫(√x³+³√x²)dx = ∫ { [tex](x^{3})^{1/2} + (x^{2})^{1/3}[/tex] dx

= ∫[tex](x^{3/2} )+ (x^{2/3} )[/tex] dx

We can split the above indefinite integral as,

= ∫[tex](x^{3/2} )[/tex] dx + ∫[tex](x^{2/3} )[/tex] dx

= [tex](x^{5/2} )/(5/2) + (x^{5/3} )/(5/3)[/tex] + c

where c is an arbitrary constant

= [tex]2(x^{5/2} )/5 + 3(x^{5/3} )/5[/tex] + c

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The statement first, third, and fifth are correct because the range of a function [-1, ∞), and the Axis of symmetry is x = 3.

It is described as a particular kind of relationship, and each value in the domain is associated to exactly one value in the range according to the function. They have a predefined domain and range.

We serve a purpose:

f(x) = (x – 3) ² – 1

The domain of a quadratic function is (-∞, ∞)

The range of a function [-1, ∞)

The function decreases over the interval (-∞, 3)

The Axis of symmetry is x = 3

The vertex is at (3, -1)

Thus, the statement first, third, and fifth are correct because the range of a function [-1, ∞), and the Axis of symmetry is x = 3.

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The volume of cube A is 123 m³.

A cube is a three-dimensional solid object with six square faces, all of which are congruent to each other, and each pair of adjacent faces meet at a right angle. In other words, a cube is a regular polyhedron with six congruent square faces. The cube is a special case of a rectangular parallelepiped, where all the edges have the same length.

In mathematics, preimage refers to the set of all elements in the domain of a function that map to a specific element in the range of the function. More specifically, if f is a function from a set A to a set B, and y is an element of B, then the preimage of y under f is the set of all elements in A that map to y. The preimage of y is denoted by f⁻¹(y), where f⁻¹ represents the inverse image or preimage operator.

Use the formula for the relationship between the volumes of similar figures under dilation:

(Volume of Image) = (Scale Factor)³ ×(Volume of Preimage)

In this case, cube B is the image and cube A is the preimage, and the scale factor is 4. Let Vₙ be the volume of cube A. Then we have:

7872 = 4³ × Vₙ

Simplifying, we get:

Vₙ = 7872 / 64 = 123

Therefore, the volume of cube A is 123 m³.

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The Intergrations are 0.30543..., 9/4, 1.

Given are definite integrations, we need to integrate,

1) [tex]\int\limits^4_3 {\frac{1}{3x-7} } \, dx[/tex]

Applying u substitution,

[tex]=\int _2^5\frac{1}{3u}du[/tex]

[tex]=\frac{1}{3}\cdot \int _2^5\frac{1}{u}du[/tex]

[tex]=\frac{1}{3}\left[\ln \left|u\right|\right]_2^5[/tex]

[tex]=\frac{1}{3}\left(\ln \left(5\right)-\ln \left(2\right)\right)[/tex]

[tex]= 0.30543\dots[/tex]

2) [tex]\int _0^1\left(x+1\right)\left(x^2+2x\right)dx[/tex]

Applying u substitution,

[tex]=\int _0^3\frac{u}{2}du[/tex]

[tex]=\frac{1}{2}\left[\frac{u^2}{2}\right]_0^3[/tex]

[tex]=\frac{1}{2}\cdot \frac{9}{2}\\\\\=\frac{9}{4}[/tex]

3) [tex]\int _{-1}^1\left|x\right|dx[/tex]

[tex]=\int _{-1}^0-xdx+\int _0^1xdx[/tex]

[tex]=\frac{1}{2}+\frac{1}{2}\\\\=1[/tex]

Hence, the Intergrations are 0.30543..., 9/4, 1.

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After answering the query, we may state that In order to calculate the price, x, in dollars for 80 ounces of organic apples, the following equation must be used: x = 1.5(80); x = 120.00; x = $120.00

A mathematical equation is a formula that connects two claims and uses the equals symbol (=) to denote equivalence. An equation in algebra is a mathematical statement that establishes the equivalence of two mathematical expressions. For instance, in the equation 3x + 5 = 14, the equal sign places a space between the variables 3x + 5 and 14. The relationship between the two sentences that are written on each side of a letter may be understood using a mathematical formula. The symbol and the single variable are frequently the same. as in, 2x - 4 equals 2, for instance.

We may use the proportionality equation if we assume that the price of apples is directly proportionate to their weight:

Cost per ounce = Cost of apples / weight of apples

This calculation may be used to determine the price per ounce of apples:

Cost per ounce is $30 divided by 30 ounces

$30 ounces x $45.00 per ounce

$1.50 per ounce is the price.

We can utilise the price per ounce we now have knowledge of to calculate the price of 80 ounces of organic apples:

Cost of 80 ounces = Price per ounce x Apples' weight

80 ounces at $1.50 each equals the cost.

80 ounces are priced at $120.00.

In order to calculate the price, x, in dollars for 80 ounces of organic apples, the following equation must be used:

x = 1.5(80)

x = 120.00

x = $120.00

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From the total amount of $8000, $3000 was invested at 3% interest rate and $5000 was invested at 5% interest rate.

We are required to determine how much of $8,000 was invested at each account with 3% and 7% annual interest rate.

1. Let x be the amount invested at 3% and (8000 - x) be the amount invested at 7%.

2. The total interest earned for the year is $440.

3. Write an equation for the total interest:

0.03x + 0.07(8000 - x) = 440.

4. Solve for x:

0.03x + 560 - 0.07x = 440

-0.04x = -120

x = 3000

So, $3000 was invested at 3%

5. Subtract $3000 from $8000:

8000 - 3000 = 5000

So, $5000 was invested at 7%.

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Magnetic field must be in YZ plane except in negative and positive Z direction.

Explanation:

Here loop is in XY plane and current direction as defined then its magnetic moment is in negative Z direction.

So to rotate loop about X axis force should be in plane YZ.

Thus torque produced by this magnetic force is in direction of X axis.

Now we know torque on a loop is calculated by

Torque=magnetic moment × B (vector cross product)(Here B is magnetic field)

Thus magnetic field can be in  the positive and negative Y direction and Z direction.

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complete question:

A current loop lies in the xy plane of an xyz coordinate system, with the current circulating counterclockwise when viewed looking down the positive z axis toward the origin. The loop experiences a torque about the x axis that is counterclockwise when viewed looking down the positive x axis toward the origin. Part A Describe the direction of the uniform external magnetic field responsible for this torque. Describe the direction of the uniform external magnetic field responsible for this torque. The magnetic field is in the positive y direction. The magnetic field is in the negative x direction. The magnetic field is in the positive x direction. The magnetic field is in the negative y direction. The magnetic field is in the positive z direction. The magnetic field is in the negative z direction. Request Answer

If both pairs of opposite sides of a quadrilateral are parallel, then the consecutive interior angles of the quadrilateral must be supplementary.

In a quadrilateral, opposite sides are parallel when the corresponding sides are parallel and the opposite angles are equal. When a pair of parallel lines is intersected by a transversal (such as a pair of opposite sides in a quadrilateral), several pairs of angles are formed.

One important pair of angles are the consecutive interior angles, which are formed by a transversal intersecting two parallel lines and are located on the same side of the transversal between the parallel lines. Consecutive interior angles are always supplementary, meaning they add up to 180 degrees.

Therefore, if both pairs of opposite sides of a quadrilateral are parallel, then the consecutive interior angles of the quadrilateral must be supplementary.

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The absolute maximum is f(-3) = 7 and the absolute minimum is f(2) = 0 and the critical points is x = ln(2).

Let's apply this method to the equation f(x) = eˣ+5 + e⁻ˣ 2. To find the critical points, we need to find the derivative of the equation, which is f'(x) = eˣ - 2e⁻ˣ. Setting this derivative to zero, we get eˣ = 2e⁻ˣ. Taking the natural logarithm of both sides, we get x = ln(2/1), which simplifies to x = ln(2). Therefore, the critical point of this equation is x = ln(2).

Now let's move on to the equation f(x) = 4 – x² over the interval x € (-3,1). To find the local and absolute extrema, we need to follow a few steps.

First, we find the critical points of the equation, which we already know are x = -2 and x = 2. Next, we evaluate the function at these critical points and at the endpoints of the interval, which are f(-3) = 7, f(-2) = 0, f(1) = 3, and f(2) = 0.

Now we can determine the local and absolute extrema. Local extrema occur at critical points, so we can see that f(-2) is a local maximum and f(2) is a local minimum.

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The area of the regular 20-sided polygon is approximately 8140.8 square centimeters.

A regular polygon is a closed geometric shape that has all sides of equal length and all angles of equal measure. In other words, a regular polygon is a polygon with symmetry.

The formula for the area of a regular polygon:

                  Area = (1/4) n × s² cot (π/n)

Where n = the number of sides

s = the length of each side

π = pi (approximately 3.14159)

Here we have

A regular polygon has an exterior angle of 18° and one of its sides 16 cm

The exterior angle of a regular polygon is given by the formula:

Exterior angle = 360°/number of sides

So, we have:

=> 18° = 360°/Number of sides

=> Number of sides = 360°/18°

=> Number of sides = 20

Each exterior angle of a regular 20-sided polygon is 18°, so each interior angle is 180° - 18° = 162°.

Since the polygon is regular, all the sides have the same length hence from the data length each side of the polygon is 16 cm

Using the formula for the area of a regular polygon:

=> Area = (1/4) n × s² cot (π/n)

=> Area = (1/4) (20) × (16)² cot (3.14/20)

=> Area = 5 × 256 cot (0.157)

=> Area = 1280 × 6.36

=> Area = 8140.8

Therefore,

The area of the regular 20-sided polygon is approximately 8140.8 square centimeters.

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The student takes 150 minutes to mow 3 lawns, which means he takes 50 minutes to mow one lawn. Therefore, the correct prediction is that it will take him 10 hours to mow 12 lawns. So, the correct answer is A).

Based on the given information, we know that the student takes 150 minutes to mow 3 lawns. Therefore, the time it takes him to mow one lawn is 50 minutes (150 divided by 3).

If the student has 12 lawns to mow, he will need to spend 12 times the time it takes him to mow one lawn.

So, the prediction is that it will take him 12 times 50 minutes, which equals 600 minutes, or 10 hours, to mow 12 lawns.

Therefore, the correct prediction is: It will take him 10 hours to mow 12 lawns. So, the correct answer is A).

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The point on the parabola closest to P ( 8 , 21 ) is Q ( 8 , 7 )

Given the parabola y = 16 - r² and the point (8, 21), we want to find the point on the parabola that is closest to the given point.

To find the point on the parabola closest to (8, 21), we can use the distance formula to calculate the distance between any point on the parabola and (8, 21), and then minimize that distance.

Let's denote the x-coordinate of the point on the parabola as x and the corresponding y-coordinate as y, so we have the point (x, y) on the parabola y = 16 - r²

The distance between this point and the given point (8, 21) is given by the distance formula:

d = √((x - 8)² + (y - 21)²)

Substituting y = 16 - r², we get:

d = √((x - 8)² + (16 - r² - 21)²)

To minimize the distance, we can minimize the square of the distance, which is equivalent to minimizing:

f(x, r) = (x - 8)² + (16 - r - 21)²

Now, let's take partial derivatives of f(x, r) with respect to x and r, and set them to zero to find the critical points:

∂f/∂x = 2(x - 8) = 0.

∂f/∂r = 2(r² + 5r - 37)(-2r) = 0.

Solving the first equation for x, we get:

x - 8 = 0,

x = 8

Substituting this value of x back into the equation for y on the parabola, we get:

y = 16 - r²

So, the critical point on the parabola is (8, 16 - r²)

Now, let's solve the second equation for r:

2(r² + 5r - 37)(-2r) = 0.

Setting each factor to zero separately:

r² + 5r - 37 = 0,

(r + 8)(r - 3) = 0.

So, r = -8 or r = 3.

Since r represents the distance from the x-axis to the point on the parabola, it must be non-negative. Therefore, we discard the solution r = -8.

Finally, substituting r = 3 into the coordinates of the critical point, we get:

(x, y) = (8, 16 - r²) = (8, 16 - 3²) = (8, 7).

Hence , the point on the parabola y = 16 - r² closest to the point (8, 21) is (8, 7)

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The area of the region enclosed by the curves y=x² and y=|x| is 1/2 square units.

To begin, we need to visualize the two curves on the coordinate plane. The first curve y=x² is a parabolic function that opens upwards and passes through the origin. The second curve y=|x| is a V-shaped function that opens upwards and passes through the origin as well.

The integral for the left part of the curve (from -1 to 0) is:

∫(-1 to 0) [x²-(-x)]dx

which simplifies to:

∫(-1 to 0) (x²+x)dx

Integrating this expression gives us:

[x^3/3 + x²/2] from -1 to 0

Substituting the limits of integration gives us:

(0-(-1/3)) + (0-0) = 1/3

Thus, the area enclosed by the curves y=x² and y=|x| from -1 to 0 is 1/3 square units.

The integral for the right part of the curve (from 0 to 1) is:

∫(0 to 1) [x²-(x)]dx

which simplifies to:

∫(0 to 1) (x²-x)dx

Integrating this expression gives us:

[x^3/3 - x²/2] from 0 to 1

Substituting the limits of integration gives us:

(1/3-(1/2)) + (0-0) = -1/6

Thus, the area enclosed by the curves y=x² and y=|x| from 0 to 1 is 1/6 square units.

Finally, to get the total area, we add the areas from both parts:

1/3 + 1/6 = 1/2

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The variance of the distribution is 1.59375, which indicates the level of uncertainty associated with the actual rate of cleanser pumped by the machine.

The variance of a distribution is a measure of how spread out the values are from the mean. In this case, the uniform distribution over the interval 9 to 13.5 can be represented by the following probability density function:

f(x) = 1/(13.5 - 9) = 1/4.5, for 9 ≤ x ≤ 13.5

where x represents the rate of cleanser pumped by the machine.

To find the variance, we need to first find the mean or expected value of the distribution. The expected value of a uniform distribution over an interval [a, b] is given by:

E(x) = (a + b)/2

Therefore, in this case, the expected value of the distribution is:

E(x) = (9 + 13.5)/2 = 11.25

Next, we can use the formula for variance to find the spread of the distribution:

Var(x) = ∫(x - E(x))² x f(x) dx, for a ≤ x ≤ b

where f(x) is the probability density function of the distribution.

Substituting the values, we get:

Var(x) = ∫(x - 11.25)² x (1/4.5) dx, for 9 ≤ x ≤ 13.5

Simplifying the expression, we get:

Var(x) = [(x - 11.25)³ / (3 x 4.5)] from 9 to 13.5

= (1/3 x 4.5) x [(13.5 - 11.25)³ - (9 - 11.25)³]

= (1/3 x 4.5) x [(2.25)³ - (-2.25)³]

= (1/3 x 4.5) x (11.390625 - (-11.390625))

= (1/3 x 4.5) x (22.78125)

= 1.59375

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