Use variation of parameters method to find the general solution of the following differential equations: (i) y" – 4y' + 3y = e" (ii) y" – 2y' + y = e^x/x²+1

The coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3/7 inches.

To describe the flat surface of a washer that is 3.6 inches in diameter and has an inner hole with a diameter of 3/7 inch, we can use the following inequalities:

For the outer circumference of the washer:

[tex]x^2 + y^2[/tex]≤ [tex](3.6/2)^2[/tex]

where x and y are the coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3.6/2 inches.

For the inner circumference of the washer:

[tex]x^2 + y^2[/tex] ≥ [tex](3/14)^2[/tex]

where x and y are the coordinates of any point on the flat surface of the washer, and the radius is half of the diameter, which is 3/7 inches.

Note that these inequalities represent the circular boundaries of the flat surface of the washer, where the outer circumference is a circle with radius 1.8 inches and the inner circumference is a circle with radius 3/14 inches. The flat surface of the washer is the region bounded by these two circles.

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Answer:

1(1/2)

Step-by-step explanation:

how you use this is do 7 divided by 11 and 11 divided by 6 which is 1 and 1/2

Answer:

77/66 (simplified would equal 7/6)

Step-by-step explanation:

When multiplying fractions you simply just multiply the numerators together, making the new numerator, then multiply the denominators together, making the new denominator, and  you have your answer.

EXTRA: To simplify the fraction to its simplest you find a number that both the numerator and the denominator can be divided into equally, in this case it would be 11, then divide the numerator and denominator by this number and that would be your answer. Example; 77/66, divide 77 and 66 by 11 and you get 7/6.

Hope this helps (:

The two atoms are of elements in the same group in the periodic table include the following: D. Atom 1 and Atom 2.

In Chemistry, a periodic table can be defined as an organized tabular array of all the chemical elements that are typically arranged in order of increasing atomic number (number of protons), in rows.

In Chemistry, valence electrons can be defined as the number of electrons that are present in the outermost shell of an atom of a specific chemical element.

In this context, we can reasonably infer and logically deduce that both Atom 1 and Atom 2 represent chemical elements that are in the same group in the periodic table because they have the same valence electrons of six (6).

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Complete Question:

A student is studying the ways different elements are similar to one another. Diagrams of atoms from four different elements are shown below.

Which two atoms are of elements in the same group in the periodic table?

If the order contains 22 products, it will take 16.06 minutes to gather the items. The correct option is (b).

Based on the given regression output, the equation to predict the time it takes to gather items from the number of items in an order is:

Predicted time [tex]= 3.0979 + 2.7633[/tex] × (square root of items)

To find the predicted time for an order with 22 items, we can substitute the value of 22 into the equation:

Predicted time [tex]= 3.0979 + 2.7633[/tex] × (square root of 22)

Predicted time ≈ [tex]16.06[/tex]

The predicted time is estimated using a least-squares regression analysis that relates the number of items in an order to the time taken to gather them. The regression output provides the equation to predict the time. By substituting the value of 22 items into the equation, the predicted time is calculated to be approximately 16.06 minutes.

Therefore, the predicted time, in minutes, that it took to gather the items for an order with 22 items is approximately 16.06 minutes.

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Complete Question:

Workers at a warehouse of consumer goods gather items from the warehouse to fill customer orders. The number of Items in a sample of orders and the time, in minutes, it took the workers to gather the items were recorded. A scatterplot of the recorded data showed a curved pattern, and the square root of the number of items was taken to create a linear pattern. The following table shows computer output from the least-squares regression analysis created to predict the time it takes to gather items from the number of items in an order.

Predictor                       Coef

Constant                       3.0979

Square root of items    2.7633

R-Sq=96.7%

Based on the regression output, which of the following is the predicted time, in minutes, that it took to gather the items if the order has 22 Items?

a. 7.99

b. 16.06

c. 27.49

d. 17.29

e. 63.89

The equation of the tangent plane to the given surface at the specified point (3, -2, 18) is z - 18 = 8(x - 3) - 12(y + 2).

To find the equation of the tangent plane to the given surface at the specified point (3,-2,18), we first need to find the partial derivatives of z with respect to x and y:

∂z/∂x = 4(x-1)
∂z/∂y = 12(y+3)

Then, we can evaluate these partial derivatives at the given point (3,-2,18):

∂z/∂x = 4(3-1) = 8
∂z/∂y = 12(-2+3) = -12

Next, we can use these partial derivatives and the point (3,-2,18) to write the equation of the tangent plane in point-normal form:

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

Plugging in the values we found:

z - 18 = 8(x - 3) - 12(y + 2)

Simplifying:

8x - 12y - z = -22

Therefore, the equation of the tangent plane to the given surface at the point (3,-2,18) is 8x - 12y - z = -22.
To find an equation of the tangent plane to the given surface z = 2(x - 1)^2 + 6(y + 3)^2 + 4 at the specified point (3, -2, 18), follow these steps:

1. Calculate the partial derivatives of the function with respect to x and y:
∂z/∂x = 4(x - 1)
∂z/∂y = 12(y + 3)

2. Evaluate the partial derivatives at the specified point (3, -2, 18):
∂z/∂x(3, -2) = 4(3 - 1) = 8
∂z/∂y(3, -2) = 12(-2 + 3) = -12

3. Use the tangent plane equation to find the tangent plane at the specified point:
z - z0 = ∂z/∂x(x - x0) + ∂z/∂y(y - y0)
where (x0, y0, z0) = (3, -2, 18)

4. Plug in the values and simplify the equation:
z - 18 = 8(x - 3) - 12(y + 2)

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Answer:

99.6%

Step-by-step explanation:

It shows how they got the answer

It was correct

I js took the test

tysm!

According to Financial experts you should save between 10% to 15% of your annual income for retirement. For a salary of $79,000/year, the minimum saved should be between $790,000 to $948,000.

Financial experts generally recommend that you should aim to save between 10% to 15% of your income each year for retirement. For a salary of $79,000 per year, this means saving between $7,900 to $11,850 annually.

Assuming you have been saving for retirement throughout your working years and are ready to retire, financial experts suggest that you should have saved at least 10 to 12 times your current annual income to maintain your pre-retirement standard of living. Therefore, the minimum you should have saved in retirement accounts is

$79,000 x 10 = $790,000 (using the conservative end of the range)

or

$79,000 x 12 = $948,000 (using the more aggressive end of the range)

Therefore, the minimum you should have saved in retirement accounts if you are currently making $79,000/year is between $790,000 to $948,000, depending on the end of the range you choose to follow.

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P(3) is approximately equal to  0.139.

(a) Yes, we can use the Poisson approximation to find P(30 < x < 35) because both np and n(1-p) are greater than or equal to 10, where n = 100 and p = 0.3. Therefore, the conditions for the Poisson approximation are satisfied.

Using Poisson approximation, we have:

λ = np = 100 x 0.3 = 30

P(30 < x < 35) ≈ P(X = 31) + P(X = 32) + P(X = 33) + P(X = 34)

= e^(-λ) * ([tex]λ^31[/tex] / 31!) + e^(-λ) * (λ^32 / 32!) + e^(-λ) * (λ^33 / 33!) + e^(-λ) * (λ^34 / 34!)

≈ 0.1885

(b) Using the normal approximation, we have:

µ = np = 100 x 0.3 = 30

σ = sqrt(np(1-p)) = sqrt(100 x 0.3 x 0.7) = 4.58

P(30 < x < 50) ≈ P((30 - µ)/σ < (x - µ)/σ < (50 - µ)/σ)

≈ P(-4.34 < Z < 4.34) [where Z is a standard normal random variable]

≈ 1

Therefore, P(30 < x < 50) is approximately equal to 1.

(c) Let x be a binomial random variable with n = 4 and P(0) = 0.0081.

We need to find P(3).

Let P(1) = q

Then, from the given information, we have:

P(0) = (1-q)^4 = 0.0081

Solving for q, we get:

q = 1 - (0.0081)^(1/4) ≈ 0.207

Now, using the binomial probability formula, we have:

P(3) = (4 choose 3) * q^3 * (1-q)^1

= 4 * 0.207^3 * 0.793

≈ 0.139

Therefore, P(3) is approximately equal to 0.139.

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In the statistical argument provided, Emily concludes that everyone in the class must have received a high grade on the quiz based on the information from her study group. The fallacy being committed in this argument is a combination of A. Biased Sample Fallacy and B. Hasty Generalization Fallacy.

A. Biased Sample Fallacy occurs when the sample is used to make a conclusion that is not representative of the entire population. In this case, Emily's study group consists of 16 students out of a total of 30 students in her class. The study group may not be representative of the whole class, as it is a smaller sample and could be composed of more diligent or prepared students.

B. Hasty Generalization Fallacy is when a conclusion is made based on insufficient evidence. In this argument, Emily concludes that everyone in the class must have received a high grade based on the performance of her study group alone. This is a hasty generalization as she has not considered the performance of the other students in the class.

To sum up, the argument commits both A. Biased Sample Fallacy and B. Hasty Generalization Fallacy, as it bases its conclusion on a potentially unrepresentative sample and insufficient evidence.

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The area of the shaded region is 9198.11 in³ - 112.5 in².

We have,

Sphere:

Diameter = 26 in

Radius = 26/2 = 13 in

Volume.

= 4/3 πr³

= 4/3 x 3.14 x 13 x 13 x 13

= 9198.11 in³

Now,

The unshaded region is a trapezium.

Height = 5 in

Parallel sides = 19 in and 26 in

Area = 1/2 x height x (sum of the parallel sides)

= 1/2 x 5 x (19 + 26)

= 1/2 x 5 x 45

= 1/2 x 225

= 112.5 in²

Now,

The area of the shaded region.

= Volume of the sphere - Area of the trapezium

= 9198.11 in³ - 112.5 in²

Thus,

The area of the shaded region is 9198.11 in³ - 112.5 in².

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The coordinate point (8, -15) is lies in fourth quadrant.

The given coordinate point is (8, -15).

Part A: Here, x-coordinate is positive that is 8 and the y-coordinate is negative that is -15.

Quadrant IV: The bottom right quadrant is the fourth quadrant, denoted as Quadrant IV. In this quadrant, the x-axis has positive numbers and the y-axis has negative numbers.

So, the point lies in IV quadrant.

Part B:

Here r²=x²+y²

r²=8²+(-15)²

r²=64+225

r²=289

r=√289

r=17 units

So, the radius is 17 units

Therefore, the coordinate point (8, -15) is lies in fourth quadrant.

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The probability of puling out

In order to calculate the probability of extracting each shape from the bag, a formula can be employed:

Probability = Number of times the shape was taken out / Total number of times shapes were taken out

Given below are the frequency of each shape:

Triangle: 3 times

Circle: 12 times

Square: 9 times

Total number of times shapes were taken out = 3 + 12 + 9 = 24

Probability of taking out a Triangle

= 3 / 24

= 1/8

Probability of taking out a Circle

= 12/24

= 1/2

Probability of taking out a Square

= 9/24

= 3/8

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The answers are:

(a) f is decreasing on (-∞, 0) and increasing on (0, ∞).

(b) f is concave up on (-∞, ∞).

(c) Local minimum value at x = 0, local maximum value DNE.

(d) Global minimum value is -2 at x = -1, global maximum value is 22 at x = 2.

(e) There are no points of inflection.

(a) To find where the function is increasing or decreasing, we need to find the critical points and test the intervals between them:

[tex]f(x) = x^4 + 3x^3 + 3x^2\\f'(x) = 4x^3 + 9x^2 + 6x[/tex]

Setting f'(x) = 0, we get:

[tex]0 = 2x(2x^2 + 3x + 3)[/tex]

The quadratic factor has no real roots, so the only critical point is x = 0.

We can test the intervals (-∞, 0) and (0, ∞) to find where f is increasing or decreasing:

For x < 0, f'(x) is negative, so f is decreasing.

For x > 0, f'(x) is positive, so f is increasing.

Therefore, f is decreasing on (-∞, 0) and increasing on (0, ∞).

(b) To find where the function is concave up or concave down, we need to find the inflection points:

f''(x) =[tex]12x^2 + 18x + 6[/tex]

Setting f''(x) = 0, we get:

0 = [tex]6(x^2 + 3x + 1)[/tex]

The quadratic factor has no real roots, so there are no inflection points.

Since the second derivative is always positive, f is concave up everywhere.

(c) To find the local extreme values, we need to find the critical points and determine their nature:

f'(x) = [tex]4x^3 + 9x^2 + 6x[/tex]

At x = 0, f'(0) = 0 and f''(0) = 6, so this is a local minimum.

There are no local maximum values.

(d) To find the global extreme values on [-1, 2], we need to check the endpoints and the critical points:

f(-1) = -2, f(0) = 0, f(2) = 22

The global minimum value is -2 at x = -1, and the global maximum value is 22 at x = 2.

(e) To find the points of inflection, we need to find where the concavity changes:

Since there are no inflection points, there are no points of inflection.

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For a polygon which is composed of three rectangles and dimensions are 4 ft× 2ft, 4 ft× 3 ft , 8 ft × 1.2ft. Area of polygon is 29.6 ft².

In geometry, a polygon is defined as the flat or plane surface, two-dimensional closed shape of boundaries. The sides of a polygon are also known as its edges. The points where two sides meet are called vertices (or corners) of a polygon. We have a polygon is composed of three rectangles.

The dimensions of rectangles are the following, 4 ft× 2ft, 4 ft× 3 ft , 8 ft × 1.2ft. We have to determine the area of polygon in square feet. The area of a polygon is defined as total space covered within the shape. The measurement is completed with square units. Rectangles are regular shape. The area of rectangle = length × width

Total area of polygon is equals to the sum of areas of three rectangles. So, area of polygon = 4 ft × 2 ft + 4 ft × 3 ft + 8 ft × 1.2 ft

= 8 ft² + 12 ft² + 9.6 ft²

= 29.6 ft²

Hence, required value is 29.6 ft².

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Answer:

$8.40

Step-by-step explanation:

2w + 5g = 57

w + 3g = 32.7

w = 32.7 - 3g

2(32.7 - 3g) + 5g = 57

65.4 - 6g + 5g = 57

8.4 = g

Answer: $8.40

The minimum sample size needed to construct a 95% confidence interval with a margin of error of 0.06 for the population proportion supporting candidate A is 268 residents.

To find the minimum sample size for a 95% confidence interval on the population proportion supporting candidate A, we'll need to use the following terms: sample size (n), population proportion (p), margin of error (E), and confidence level (z-score).

First, let's determine the proportion supporting candidate A from the preselected poll:
100 residents - 22 (supporting B) - 14 (supporting C) = 64 (supporting A)
So, the proportion p = 64/100 = 0.64.

For a 95% confidence interval, the z-score is 1.96 (found using a standard normal distribution table or calculator).

Now, we can use the formula for sample size calculation:
n = (z² × p × (1-p)) / E²

Substituting the values:
n = (1.96² × 0.64 × 0.36) / 0.06²
n ≈ 267.24

Since sample size must be a whole number, we round up to the nearest whole number, which is 268.

Therefore, the minimum sample size needed to construct a 95% confidence interval with a margin of error of 0.06 for the population proportion supporting candidate A is 268 residents.

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|| (3,3) - (1,1) || < 2 + r

Simplifying this inequality, we get:

2√2 < 2 + r

r > 2√2 - 2

So, any value of r such that r > 2√2 - 2 will satisfy the condition B2(1,1)∩Br(3,3)≠0.

For the first question, we need to find an r such that the open ball centered at (0,0) with radius 1 (denoted as Br(0,1)) intersects with the open ball centered at (2,0) with radius t (denoted as Bt(2,1)). Since the usual norm is the Euclidean norm, the distance between (0,0) and (2,0) is 2. Thus, we have the inequality:

|| (2,0) - (0,0) || < 1 + t

Simplifying this inequality, we get:

2 < 1 + t

t > 1

So, any value of r such that 1 < r < 3 will satisfy the condition Br(0,1) ∩ Bt(2,1)≠0.

For the second question, we need to find an r such that the open ball centered at (1,1) with radius 2 (denoted as B2(1,1)) intersects with the open ball centered at (3,3) with radius r (denoted as Br(3,3)). Using the Euclidean norm, we have:

|| (3,3) - (1,1) || < 2 + r

Simplifying this inequality, we get:

2√2 < 2 + r

r > 2√2 - 2

So, any value of r such that r > 2√2 - 2 will satisfy the condition B2(1,1)∩Br(3,3)≠0.

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The explicit formula of the sequence is -3n + 36.

The sequence above is a arithmetic progression. Therefore, let's write the nth term of the sequence.

Hence,

33, 30, 27

a + (n - 1)d = nth term

where

Therefore,

a = 33

d = 30 - 33 = -3

n = number of term

Hence,

nth term = 33 + (n - 1)-3

nth term = 33 - 3n + 3

nth term = -3n + 36

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For the answer of factors of expression (12 + 54), in the form of a(b + c), where a is the GCF of 12 and 54 is equals to 6( 2 + 9).

In math, to factor a number means to express it as a product of (other) whole numbers, called its factors. For example, if 7x5 = 35, 7 and 5 are both factors. The divisors that give the remainder to be 0 are the factors of the number. We have an expression of numbers, 12 + 54. We have to write this expression in form of a( b + c), where a is GCF of 12 and 54. Now, we can write the factors of 12 and 54 are 12 = 2×2×3

54 = 2×3 ×3×3

The greatest common factor, GCF of 12 and 54 is 2×3 = 6. So, 12 + 54 = 6× 2 + 6×9

Taking out the common factor 6 from above expression, 6( 2 + 9) which is required form a( b + c). Hence, required expression is 6( 2 + 9).

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Answer:

1/4

Step-by-step explanation:

it came to me in a dream.

1/4 or 25% is the probability that the randomly selected point is in the bullseye.

Probability is a number that expresses the likelihood or chance that a specific event will take place. Both proportions ranging from 0 to 1 and percentages ranging from 0% to 100% can be used to describe probabilities.

The area of the bullseye is the area of the inner circle with a radius of 4 cm. Similarly, the area of the entire target is the area of the outer circle with a radius of 8 cm.

The area of a circle is given by the formula A = πr², where A is the area and r is the radius.

Therefore, the area of the bullseye is:

A_bullseye = π(4 cm)² = 16π cm²

And the area of the entire target is:

A_target = π(8 cm)² = 64π cm²

So, the probability that the randomly selected point is in the bullseye is the ratio of the area of the bullseye to the area of the target:

P(bullseye) = A_bullseye / A_target

P(bullseye) = (16π cm²) / (64π cm²)

P(bullseye) = 1/4

Therefore, the probability that the randomly selected point is in the bullseye is 1/4 or 25%.

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The probability that either event will occur is given as follows:

P(A or B) = 0.75.

The formula used to calculate the probability is given as follows:

P(A or B) = P(A) + P(B) - P(A and B).

The total number of events from the Venn's diagram is given as follows:

4 x 9 = 36.

Hence the probability of each outcome is given as follows:

Hence the or probability is given as follows:

P(A or B) = P(A) + P(B) - P(A and B).

P(A or B) = 0.5 + 0.5 - 0.25

P(A or B) = 0.75.

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The value of the sides are;

CB = 13.8

CD = 6. 9

To determine the value of the sides of the triangle, we need to know the different trigonometric identities are;

From the information given, we have that;

Using the sine identity, we have that;

tan 60 = CD/4

cross multiply the values, we have;

CD = 4(1.73)

multiply the values

CD = 6.9

To determine the value;

sin 30 = 6.9/CB

CB = 13.8

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P(X = k) = (1 - p)^4   for k = 0
P(X = k) = 4p(1 - p)^3   for k = 1
P(X = k) = 6p^2(1 - p)^2   for k = 2
P(X = k) = 4p^3(1 - p)   for k = 3
P(X = k) = p^4   for k = 4

Note that these probabilities add up to 1, as they should for any probability distribution.

(a) The distribution of X can be modeled as a binomial distribution with parameters n = 4 and p, where p is the probability that the friend correctly identifies a milk-first cup as milk-first. Each cup that the friend tastes can either be identified correctly (success) or incorrectly (failure), and there are 4 cups that were poured milk-first in the experiment.

(b) To find the probability mass function (PMF) of X, we need to find the probability of each possible value of X. Since X is a binomial random variable, the PMF of X is given by:

P(X = k) = (n choose k) * p^k * (1 - p)^(n - k)

where (n choose k) is the binomial coefficient, given by:

(n choose k) = n! / (k! * (n - k)!)

where n! denotes the factorial of n.

In this case, n = 4 and there are 4 cups that were poured milk-first, so we have:

P(X = 0) = (4 choose 0) * p^0 * (1 - p)^4 = (1 - p)^4

P(X = 1) = (4 choose 1) * p^1 * (1 - p)^3 = 4p(1 - p)^3

P(X = 2) = (4 choose 2) * p^2 * (1 - p)^2 = 6p^2(1 - p)^2

P(X = 3) = (4 choose 3) * p^3 * (1 - p)^1 = 4p^3(1 - p)

P(X = 4) = (4 choose 4) * p^4 * (1 - p)^0 = p^4

Since X can only take on values between 0 and 4, the PMF of X is given by:

P(X = k) = (1 - p)^4   for k = 0
P(X = k) = 4p(1 - p)^3   for k = 1
P(X = k) = 6p^2(1 - p)^2   for k = 2
P(X = k) = 4p^3(1 - p)   for k = 3
P(X = k) = p^4   for k = 4

Note that these probabilities add up to 1, as they should for any probability distribution.

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The value of d in millimeters is 12 mm and this can be determined by using the similar triangle property.

Triangle RST is similar to  triangle RVW.

The length of the segment RW = 10 mm

The length of the segment WT = 5 mm

The length of the segment TS = 18 mm

The following steps can be used in order to determine the value of d in millimeters:

The similar triangle property can be used in order to determine the value of d in millimeters.

The value will be:

= 10/15 × 18

= 12

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The population of interest in this study is all births in southern California between the years 1989 and 1993. The sample in this study is 143,196 births for which length of gestation data and air pollution exposure during gestation were collected.

The results of this study cannot be generalized to the entire population of births in southern California beyond the years 1989 to 1993. However, the findings of the study can still provide valuable insights into the relationship between air pollutants and preterm births in this specific population and time period. It is also important to note that this study alone cannot establish causal relationships between air pollutants and preterm births, as other factors may contribute to preterm births that were not measured or accounted for in this study. Further research and analysis would be needed to establish causal relationships.

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The volume of the sphere is 11494.04 cubic millimeters

The correct answer is an option (B)

We know that the formula for the volume of the sphere is :

V = 4/3 × π × r³

where r is the radius of the sphere

Here, A sphere has a diameter of 28 millimeters.

so, the radius of the sphere would be,

r = d/2

r = 28/2

r = 14 mm

Using above formula the volume of the sphere would be,

V = 4/3 × π × r³

V = 4/3 × π × 14³

V = 11494.04 cubic millimeter

Therefore, the correct answer is an option (B)

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The likelihood of randomly selecting a terrier from the shelter would be unlikely. That is option B

The formula that can be used to determine the probability of a selected event is given as follows;

Probability = possible event/sample space.

The possible sample space for terriers = 15%

Therefore the remaining sample space goes for Labradors and Golden Retrievers which is = 75%

Therefore, the probability of selecting the terriers at random is unlikely when compared with other dogs.

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Answer:

[tex] \frac{2}{3} square \: units[/tex]

Answer: its 144 i think

Step-by-step explanation: Math