A square pyramid has a base that is 4 inches wide and a slant height of 7 inches. what is the surface area, in square inches, of the pyramid?

Step-by-step explanation:

It looks as though ( from your post)  Sweden won 4 golds and 0 silver and 2 bronze medals

4:0:2     simplifies to   2 :0 : 1

Lizzie's divisibility test works for numbers that are multiples of 11.

Lizzie's divisibility test for a number m works as follows: break a positive integer n into two-digit chunks, find the alternating sum of these two-digit numbers, and if the result is divisible by m, then n is also divisible by m.

For example, if we have a number n = 354764, we would break it into the two-digit chunks 64, 47, and 35, then find the alternating sum of these numbers (64 - 47 + 35 = 52).

If we want to test if n is divisible by m = 4, we check if 52 is also divisible by 4. If 52 is divisible by 4, then we can conclude that 354764 is also divisible by 4.

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There is not enough evidence to conclude that Devon's true proportion of good serves is greater than 72%.

The correct conclusion for Devon to reach is: Because the P-value of 0.06 > a (where a = 0.05), Devon should fail to reject H0. There is no convincing evidence that the proportion of services that are good is more than 72%.

The null hypothesis, H0, states that the true proportion of good serves for Devon is equal to 72%. The alternative hypothesis, Ha, states that the true proportion of good serves for Devon is greater than 72%.

The P-value is the probability of obtaining a test statistic as extreme or more extreme than the observed data, assuming that the null hypothesis is true. In this case, the P-value is 0.06, which means that if the true proportion of good serves for Devon is actually 72%, there is a 6% chance of observing a sample of 50 serves with 42 or more good serves.

Since the P-value is greater than the significance level of 0.05, we fail to reject the null hypothesis.  

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The 68% confidence interval for systolic blood pressure in women, based on the given sample, is approximate: (122.77, 124.03)

To find the 68% confidence interval for systolic blood pressure in women, we can use the standard formula:

Confidence Interval = Mean ± (Z * (Standard Deviation / √n))

Where:

Mean = 123.4 (sample mean)

Standard Deviation = 19.9 (sample standard deviation)

n = 1000 (sample size)

Z = Z-score corresponding to the desired confidence level (in this case, 68% corresponds to 1 standard deviation on each side of the mean)

To find the Z-score, we can refer to the standard normal distribution table or use a calculator. For a 68% confidence level, the Z-score is 1.

Plugging in the values, we get:

Confidence Interval = 123.4 ± (1 * (19.9 / √1000))

Calculating the square root of 1000, we have:

Confidence Interval = 123.4 ± (1 * (19.9 / 31.62))

Simplifying further, we get:

Confidence Interval = 123.4 ± (0.6301)

Therefore, the 68% confidence interval for systolic blood pressure in women, based on the given sample, is approximate: (122.77, 124.03).

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To start, let's call the width of the rectangle "w" and the height "h". We know that the area must be 500 square feet, so we can write an equation:

w*h = 500

We can solve this equation for h:

h = 500/w

Now we can express the total cost of the wire in terms of w. The cost of the wire for the width is $2.50 per foot, so the cost for that side is:

2.5w

The cost of the wire for the height is $4.25 per foot, so the cost for that side is:

4.25h = 4.25(500/w) = 2125/w

So the total cost of the wire is:

C(w) = 2.5w + 2125/w

This is our final answer expressed in function notation.
Let's denote the width of the rectangle as w and the height as h. We are given that the area of the rectangle must be 500 square feet, so we have:

w * h = 500

Now, we need to find the cost function based on the width. The cost of the wire for the width is $2.50 per foot and for the height is $4.25 per foot. Therefore, the total cost (C) can be expressed as:

C(w) = 2.50 * w + 4.25 * h

We need to express the height (h) in terms of the width (w) using the area equation:

h = 500 / w

Now, we can substitute this expression for h in the cost function:

C(w) = 2.50 * w + 4.25 * (500 / w)

This is the cost function for building the rectangle out of wire as a function of its width, given that the enclosed area must be 500 square feet.

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This is the inequality that represents all possible widths, w, in feet of the garden is W^2 + 2W - 120 ≥ 0

The area of a rectangle is given by the formula A = L x W, where A is the area, L is the length, and W is the width. In this problem, we are given that the garden is rectangular and that the length is 2 feet longer than the width, so we can write L = W + 2.

We are also told that the area of the garden is at least 120 square feet, so we can write:
A = L x W ≥ 120
Substituting L = W + 2, we get:
(W + 2) x W ≥ 120

expanding the left side, we get:
W^2 + 2W ≥ 120
Rearranging, we get:
W^2 + 2W - 120 ≥ 0

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The area of the ring created by the two circles is approximately 1374.63 square feet.

Let's first find the radius of the circumscribed circle. We can draw a diagonal of the regular octagon, which will be twice the length of one of its sides, forming an isosceles triangle with two radii of the circle.

The angle at the center of the circle between two adjacent sides of the octagon will be 360 degrees divided by 8, or 45 degrees.

The angle at the top of the isosceles triangle will be half of that, or 22.5 degrees. Using trigonometry, we can find the radius of the circumscribed circle:

[tex]$\sin(22.5^\circ) = \frac{opposite}{hypotenuse}$$\sin(22.5^\circ) = \frac{10}{2r}$$r = \frac{10}{2\sin(22.5^\circ)} \approx 21.21$[/tex]

Next, we can find the radius of the inscribed circle. Drawing radii from the center of the octagon to the points where it touches the circle, we can form 8 congruent isosceles triangles, each with a base of length 10 and two equal legs.

The angle at the top of each triangle will be half of the central angle between two adjacent sides of the octagon, or 22.5 degrees. Using trigonometry again, we can find the length of each leg of the triangle:

[tex]$\tan(22.5^\circ) = \frac{opposite}{adjacent}$$\tan(22.5^\circ) = \frac{r'}{5}$$r' = 5\tan(22.5^\circ) \approx 2.93$[/tex]

Now we can calculate the area of the ring created by the two circles:

[tex]$A = \pi R^2 - \pi r'^2$$A = \pi (21.21)^2 - \pi (2.93)^2 \approx 1374.63$ square feetTherefore, the area of the ring created by the two circles is approximately 1374.63 square feet.\\\\\\\\[/tex]

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The scale factor used is 2.

It is one of the simplest polygon shapes and is commonly used in mathematics and geometry. The sum of the internal angles of a triangle is always 180 degrees.

The vertices of a triangle are the three points in a two-dimensional (2D) or three-dimensional (3D) space that define the corners or corners of the triangle. In a 2D plane, the vertices are typically denoted as A, B, and C, and in a 3D space, they can be represented as (x1, y1, z1), (x2, y2, z2), and (x3, y3, z3) where (x, y, z) are the coordinates of each vertex along the x, y, and z axes respectively. The vertices of a triangle are connected by three line segments, known as edges, to form the sides of the triangle. The combination of the three vertices and the edges connecting them determines the shape and size of the triangle.

To find the scale factor used to dilate triangle ABC to A'B'C', we can compare the corresponding side lengths of the two triangles.

The distance between A(-3, -3) and B(3, 3) is √((3-(-3))^2 + (3-(-3))^2) = 6√2.

The distance between A'(-6, -6) and B'(6, 6) is √((6-(-6))^2 + (6-(-6))^2) = 12√2.

So the scale factor used to dilate triangle ABC to A'B'C' is:

scale factor = length of corresponding side in A'B'C' / length of corresponding side in ABC

            = (12√2) / (6√2)

            = 2

Therefore, the scale factor used is 2.

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There is no convincing evidence that the proportion of Devon's serves that are good is more than 72%. The data collected does not provide sufficient evidence to support Devon's claim that he has a higher proportion of good serves than what his coach stated.

Based on Devon's hypotheses, H₀ states that p = 72%, while Hₐ states that p > 72%, where p represents the true proportion of Devon's good serves. To test this, 50 of his serves are randomly selected, and 42 are good. A simulation is conducted with 100 trials, resulting in an estimated P-value of 0.06. The significance level (α) is set at 0.05.

In this case, the P-value (0.06) is greater than the significance level (0.05). According to the rules of hypothesis testing, we should fail to reject the null hypothesis (H₀) when the P-value is greater than the significance level. Therefore, Devon should fail to reject H₀.

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By 2009, it is projected that approximately 13,956 three-legged frogs will inhabit the area.

Recent studies have indicated a growing concern for the population of three-legged frogs in a specific area, as they have been exposed to chemical pollutants. In the year 2000, data estimated that there were about 5,000 three-legged frogs (N) in this area. With an annual increase of 15%, we can project the number of frogs in future years using the formula:

Future population = N * (1 + growth rate) ^ number of years

In this case, we want to determine the number of three-legged frogs in the area by 2009. To calculate this, we will use the given values:

Future population = 5,000 * (1 + 0.15) ^ (2009 - 2000)

Future population = 5,000 * (1.15)⁹

Future population ≈ 13,956

Therefore, by 2009, it is projected that approximately 13,956 three-legged frogs will inhabit the area, rounding to the nearest whole number. This increase in population highlights the potential ecological consequences of chemical pollutants on the environment and the need for further investigation and mitigation measures.

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A function is a rule that assingns each value of independent variable to exactly one value of the dependent variable.

A function is a mathematical concept that relates two sets of values, known as the domain and the range. The domain is the set of independent variables, while the range is the set of dependent variables. A function is a rule that assigns to each value in the domain exactly one value in the range.

For example, if we have a function f(x) = 2x + 3, the domain would be any possible value of x, and the range would be any possible value of 2x + 3. So if we put x = 2, then f(x) = 2(2) + 3 = 7. Therefore, the function assigns the value of 7 to the value of 2 in the domain.

Functions are used in various branches of mathematics, science, and engineering to model and analyze relationships between two or more variables. They are an important concept in calculus, where they are used to study rates of change and optimization problems.

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The series of transformations correctly shows that △ABC≅△XYZ is D

a translation 2 units left and a reflection over the x-axis.

if a translation happens to each point of △ABC horizontally to the left by 2 units, which means  subtracting 2 from the x-coordinate of each vertex, we notice that a transformation of ABC to coordinates that are almost identical to XYZ but let it be called it A'B'C'

A(3, 0) ⇒ A'(1, 0)

B(2, -3) ⇒ B'(0, -3)

C(0, 3) ⇒ C'(-2, 3)

Secondly, if a reflection happens to A'B'C' at the x axis the transformation becomes identical to △XYZ

A'(1, 0) ⇒ X(1, 0)

B'(0, -3) ⇒ Y(0, 3)

C'(-2, 3) ⇒ Z(-2, -3)

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Answer:  [tex]\frac{x-4}{x-7}[/tex]

Step-by-step explanation:

[tex]\frac{x^{2}-5x+4 }{x^{2} -8x+7}[/tex]    

factor the top and bottom by finding numbers that multiply to the last term but add to middle

for top part:

-4 and -1   multiply to +4 and add to -5

for bottom part:

-7 and -1 multiply to to +7 and add to -8

Those are your factored numbers, put into factored form

[tex]\frac{(x-4)(x-1)}{(x-7)(x-1)}[/tex]    now cross off same factors from top and bottom only

[tex]\frac{x-4}{x-7}[/tex]

The elevation of Death Valley, California and Tallahassee, Florida can be compared by using the inequality symbol > or <. On comparing  death valley and tallahassee, Tallahassee elevation > Death Valley elevation. On comparing  death valley and westmorland, Westmorland elevation > Death Valley elevation.

1.

Since the elevation of Death Valley is -282 feet, which is a negative value, and the elevation of Tallahassee is 203 feet, which is a positive value, we can conclude that the elevation of Tallahassee is greater than the elevation of Death Valley.

Therefore, we can use the > symbol to compare the elevations of these two locations, and write the inequality as: Tallahassee elevation > Death Valley elevation.

2.

The elevation of Death Valley is -282 feet, while the elevation of Westmorland is 157 feet.

Since the elevation of Westmorland is a positive value and is greater than the elevation of Death Valley, we can use the > symbol to compare the elevations of these two locations, and write the inequality as:

Westmorland elevation > Death Valley elevation.

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To completely recharge a 1.5-volt cell, each electron in the cell must be

supplied with a minimum energy of 2.403 × 10^-19 joules.

To completely recharge a 1.5-volt cell, each electron in the cell must be

supplied with an energy greater than or equal to the potential difference of

the cell, which is 1.5 volts.

The minimum energy required to supply to each electron can be

calculated

using the formula:

E = qV

where E is the energy in joules (J), q is the charge of an electron (1.602 ×

10^-19 coulombs), and V is the potential difference in volts.

Substituting the given values, we get:

[tex]E = (1.602 × 10^-19 C) × (1.5 V)E = 2.403 × 10^-19 J[/tex]

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Therefore, to the nearest hundredth, the value of x is 42.31 units.

A triangle is a three-sided polygon, which is a closed shape made up of straight lines. It is one of the simplest geometric shapes and is used extensively in mathematics, science, and engineering. In a triangle, each side connects two vertices or corners, and each vertex is where two sides intersect. The three angles of a triangle always add up to 180 degrees, and the sum of the lengths of any two sides is always greater than the length of the third side. Triangles can be classified by the lengths of their sides and the sizes of their angles, which gives rise to different types such as equilateral, isosceles, scalene, acute, right, and obtuse triangles. Triangles have many applications, such as in geometry, trigonometry, physics, and engineering, and they are fundamental to understanding the properties of other shapes and mathematical concepts.

Here,

In a right triangle, the sine of an angle is defined as the ratio of the length of the side opposite the angle to the length of the hypotenuse. So, for this triangle, we have:

sin(53°) = opposite / hypotenuse

sin(53°) = x / 53

To solve for x, we can rearrange the equation as follows:

x = 53 * sin(53°)

Using a calculator to evaluate sin(53°), we get:

sin(53°) = 0.7986 (rounded to four decimal places)

Substituting this value into the equation, we get:

x = 53 * 0.7986

x = 42.308 (rounded to two decimal places)

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The required answer is the nearest hundred dollars: $902.09 is approximately $900.

To find the value of the car 20 years after it was purchased, we can use the formula for exponential decay:

Value = Initial value * (1 - Depreciation rate) ^ (time elapsed / time for depreciation)

1. Determine the depreciation rate: The car's value depreciates by one half every 3.5 years, so the depreciation rate is 50% or 0.5.
Depreciation is a term that refers to two aspects of the same concept: first, the actual decrease of fair value of an asset, such as the decrease in value of factory equipment each year as it is used and wears, and second, the allocation in accounting statements of the original cost of the assets to periods in which the assets are used (depreciation with the matching principle).

Depreciation is thus the decrease in the value of assets and the method used to reallocate, or "write down" the cost of a tangible asset (such as equipment) over its useful life span

2. Calculate the number of depreciation periods: Since the car's value halves every 3.5 years, we need to find out how many 3.5-year periods are in 20 years. To do this, divide 20 by 3.5: 20 / 3.5 ≈ 5.71 periods.

3. Use the exponential decay formula:
Value = 29,000 * (1 - 0.5) ^ (5.71)
Value ≈ 29,000 * (0.5) ^ (5.71)
Value ≈ 29,000 * 0.0311
Value ≈ 902.09

4. Round the value to the nearest hundred dollars: $902.09 is approximately $900.

So, the value of the car 20 years after it was purchased is approximately $900.

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Thus, the volume of cone for the given slant height and radius is found as:  314 cu. cm.

The distance from a cone's apex to its outer rim is referred to as the segment's slant height. It is corresponding to the hypotenuse's length of a right triangle that creates the cone.

Given data:

slant height of cone  l =  13 cm

radius r =  5 cm

Let h be the height

So, using Pythagorean theorem, find height.

l² = h² + r²

h² = l² - r²

h²= 13² - 5²

h² = 169 - 25

h = 12 cm

volume of a cone = 1/3 *π*r²*h

volume of a cone = 1/3 *3.14*5²*12

volume of a cone = 3.14*25*4

volume of a cone = 314 cu. cm

Thus, the volume of cone for the given slant height and radius is found as:  314 cu. cm.

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The line of regression equation for the mileage rating of a ( point) four wheel drive vehicle is [tex]\hat y = 16.111 + 0.365x,[/tex] and the best predicted new mileage rating of a ( point) four-wheel drive vehicle when x = 19 mi/gal, is equals to the 23.046 mi/gal. So, option(b) is right one.

A linear regression line has an equation of the form [tex]\hat y = a + bx,[/tex]

where x is the independent variable and y is the dependent variable. The slope of the line is b, and a is the estimated intercept (the value of y when x = 0). We have a table form data of old and new rating of four-wheel-drive vehicles. We have to determine the line of regression. Now, we have to calculate the value of 'a' and 'b'. Let the old and new mileage rating of four-wheel-drive vehicles be represented by vaiables 'x' and 'y'. Using the following formulas, [tex]b =\frac{ S_{xy}}{S_{xx}}[/tex] where, [tex]S_{xx} = \sum x² - \frac{ (\sum x)² }{n} [/tex]

where , [tex]\bar x = \frac{\sum x }{n}[/tex]

Here, n = 11, [tex]\sum x[/tex] = 235

[tex]\sum xy[/tex] = 263, [tex]\sum x²[/tex] = 5733, [tex]\sum xy[/tex] = 5879, so

[tex]S_{xx}[/tex] = 5733 - (235)²/11

= 5733 - 5020.454 = 712.546

[tex]S_{xy}[/tex] = 5879 - (235×263)/11

= 260.364

Now, b = 260.364/712.546 = 0.365

a = (263/11) - 0.365 ( 235/11)

= 23.909 - 7.798

= 16.111

So, regression line equation is

[tex]\hat y = 16.111 + 0.365x,[/tex]

The best predicted value of y, when x = 19 mi/gal, [tex]\hat y = 19× 0.365 + 16.111[/tex]

=23.046 mi/gal

Hence, the best predicted value is

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Complete question:

10. Determine the line of regression and use it to find the best predicted new mileage rating of a ( point) four-wheel-drive vehicle given that the old rating is 19 mi/gal

old 6 27 17 33 28 24 8 22 20 29 21

New 15 24 15 29 25 22 6 20 82 6 19

a) y cap = 0.863 + 0.808x; 16.2 mi/gal

b) y cap = 16.111 + 0.365x; 23.04 mi/gal

c) y cap =0.808+ 0.863x; 17.2 mi/gal

d) y cap = 0.808 0.863x; 18.1 mi/gal

Answer:

Step-by-step explanation:

Since the two cylinders are similar, their corresponding dimensions (radius and height) are proportional. Let the radius of the smaller cylinder be r.

Then, we can write:

r / 6 = R / 30

where R is the radius of the larger cylinder.

Simplifying this equation, we get:

R = 5r

Now, we can use the formula for the volume of a cylinder to find the volume of the larger cylinder:

Volume of smaller cylinder = πr^2h = 90 cm^3

Volume of larger cylinder = πR^2H = π(5r)^2(30) = 750πr^2 cm^3

Substituting R = 5r, we get:

Volume of larger cylinder = 750πr^2 cm^3

Therefore, the volume of the larger cylinder is 750π times the volume of the smaller cylinder:

Volume of larger cylinder = 750π(90 cm^3) = 67,500π/ cm^3 (approx. 211,239.74 cm^3 rounded to five decimal places).

Probability is frequently used in news reports to convey the possibility of an event occurring.

Generally, in my opinion, probability is used well in the media space.

Probability is frequently used in news reporting to demonstrate the likelihood of an event occurring. A news story, for example, might mention that there is a 50% chance of rain tomorrow. Similarly, sports writers may use probability to forecast the outcome of games and goals to be scored.

Overall, I feel probability is utilized fairly responsibly in the media and entertainment industries, with a focus on informing or entertaining audiences rather than misleading them. However, in some cases, such as political polling or advertising, the use of probability may be incorrect or exploited to influence audiences.

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Answer:

x=6

Step-by-step explanation:

(5x+30)+80=140

5x+110=140

5x=30

x=6

answer: B

The zeros of the quadratic equation are as follows

1. y = -x²+ 6x - 5:

zeros: (1, 0) and (5, 0)

2. y = x² + 2x + 1:

zeros: (-1, 0).

3. y = -x²+ 8x - 17:

zeros: (0, 0) and (0, 0)

4. y = x² - 4:

zeros: (1, 0) and (5, 0)

Zero in a quadratic equation are x values ​​that make the equation equal to zero. In other words, they are the x-intercepts or roots of a quadratic function.

Using graphical method, a zero is the point of intersection of the curve with the x -axis and this is shown in the graph attached.

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The value of the domains is given as:

In order to find the results of (fg)(x) and (f/g)(x), we must begin by multiplying and dividing the two functions, respectively:

(fg)(x) = f(x) * g(x) = [tex]3x * 3(x + 1)^2 = 9x(x + 1)^2[/tex]; its domain containing all real numbers.

Similarly, (f/g)(x) = f(x) / g(x) = in a domain that does not [tex]3x / 3(x + 1)^2 = x / (x + 1)^2[/tex]include x = -1 (if g(x) ≠ 0).

Let us now evaluate  (fg)(5) and (f/g)(5):

(fg)(5) =[tex]9(5)(5 + 1)^2 = 9(5)*(6)^2[/tex] = 9(5(36)) = 1620 while  

(f/g)(5) = [tex]5/(5 + 1)^2 = 5/(6)^2[/tex] = 5/36.

Consequently, (fg)(5) equals 1620 and (f/g)(5) is equivalent to 5/36.

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Nora will be able to cut 52 equal pieces of yarn for her Science project.

To find out how many equal pieces of yarn Nora can cut for her Science project, we need to divide the total length of the yarn by the length of each piece.

Total length of yarn: 67.6 inches
Length of each piece: 1.3 inches

Step 1: Divide the total length by the length of each piece.
67.6 inches ÷ 1.3 inches = 52

Nora will have 52 equal pieces of yarn, each 1.3 inches long, for her Science project.

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The volume of the unoccupied space inside the cube is the volume of the cube minus the volume of the ball, which is approximately 166.

1. D. Cone. When a tree is cut down, its trunk typically has a roughly cylindrical shape with a tapered end, which closely resembles a cone.

2. B. 166. The diameter of the ball is 11 cm, which is also the length of the diagonal of the cube. Let's call the side length of the cube "s". Then, we can use the Pythagorean theorem to find s:

s^2 + s^2 + s^2 = 11^2

3s^2 = 121

s^2 = 121/3

The volume of the cube is s^3, which is approximately 166. The volume of the ball is (4/3)πr^3, where r is the radius of the ball. Since the ball fits tightly inside the cube, its diameter is equal to the side length of the cube, which is s√3. Thus, r = (s√3)/2 - 5.5.

The volume of the unoccupied space inside the cube is the volume of the cube minus the volume of the ball, which is approximately 166.

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Answer:

3.819inch

Step-by-step explanation:

Circumference(C)=24inch

radius(R)=?

Now,

C=2piR

24=2piR

12=piR

12/pi=R

R=3.819

Answer:

If point R is reflected across the x-axis, its y-coordinate will change sign. Therefore, the y-coordinate of R' will be 3 (the opposite of -3). Thus, the answer is A. (-8, 3)

Step-by-step explanation:

The area of the cross-section is 16 sq. cm. Thus, option C is the correct answer.

Vertices sides =  2, 3, 6, and 7

Divide part face = parallel to the face of vertices

It is given that a square face is present in the middle of the cube. The area of the cross-section of the cube results from the plane and cube intersection.

To find the distance between the square face of the cube and the length of the side:

distance = [tex]\sqrt{[(x^{2} - x1)^2 + (y^{2} - y1)^2 + (z^{2} - z1)^2]}[/tex]

we can use the coordinates of any two adjacent sides to find the distance.

distance = [tex]\sqrt{[(3-2)^2 + (3-2)^2 + (3-1)^2] }[/tex]

distance = [tex]\sqrt{11}[/tex]

To calculate the area of the face of the cube:

area = [tex]side^{2}[/tex]

area = [tex]\sqrt{(11)^2}[/tex]

area = 11

The area of the cross-section can be estimated as:

area = (1/2) x 11 x 4) + 5 vertices of plane

area = 16 sq. cm

Therefore we can infer that the area of the cross-section is 16 sq. cm

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