a rectangular prism with a volume of 20 in^3 is dialited with a scale facotr of 2. what is the volume of the new figure?

Answer:

4:9

Step-by-step explanation:

Answer:

Scale factor = 2.25

Step-by-step explanation:

To find the scale factor between two similar shapes, we need to compare the corresponding sides of the shapes.

The scale factor is the ratio of the length of any side of one shape to the length of the corresponding side on the other shape.

From inspection of the given diagram, the ratio of the corresponding sides of the two similar figures is:

⇒ Figure 1 : Figure 2 = 8 : 18

Therefore, to find the scale factor from Figure 1 to Figure 2, divide the side length of Figure 2 by the corresponding side length of Figure 1:

[tex]\implies \sf Scale\;factor=\dfrac{18}{8}=2.25[/tex]

A defective stamp is likely to be chosen at random 1.4% of the time, or about 0.014 times. The observed percentage probability  faulty stamps is below the 3.5% maximum permitted rate,

Name an event from one outcome. Step 2: Compile a list of all potential outcomes, including any positive ones. Step 3: Subtract the number of favorable outcomes from the total number of possibilities that are feasible.

P(faulty) = quantity of defective stamps divided by total quantity of stamps

P(defective) = 10/700.

0.014 P(defective)

Consequently, there is a 1.4% chance (or about 0.014) that a randomly chosen stamp will be flawed.

B-The observed percentage of flawed stamps is:

10 / 700 0.5 – 0.014

Divide this rate by 100 to get the percentage:

0.014 x 100 approximately 1.4%

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We can calculate Sylvia's dad purchased 8/3 pounds of potatoes for the Thanksgiving supper by using division.

Describe division?

Together with addition, subtraction, and multiplication, division is one of the four fundamental operations in mathematics. A bigger group is divided into smaller groups using the division process so that each group has an equal number of items. It is a mathematical technique for distributing and grouping things equally.

The division process is repeated subtraction. It is the polar opposite of multiplying. It is defined as the procedure for developing fair organisations. In order for the larger number taken to equal the multiplication of the smaller numbers, we divide larger numbers into smaller ones while dividing them.

Now in this question,

1 bag of potatoes is given as = 1/3 pounds

Then, 8 bags of potatoes= 8 × 1/3

=8/3 pounds

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No, we cannot perform element by element addition, subtraction, multiplication and division when the matrices are different sizes, because to do this the size of matrices should be same.

The Element-by-element operations, also called element-wise operations, can only be performed when two matrices have the same dimensions, meaning they have the same number of rows and columns.

In this case, the operations are applied to the corresponding elements of each matrix, resulting in a new matrix with the same dimensions as the original matrices.

When the two matrices have different sizes, element-by-element operations are not defined. In some cases, it may be possible to perform other types of operations, such as matrix multiplication or matrix addition (if the matrices have compatible dimensions).

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The given question is incomplete, the complete question is

Can your perform element by element addition, subtraction, multiplication and division when the matrices are different sizes?

In response to the stated question, we may state that As a result, the function journey lasted 5.1875 hours.

In mathematics, a function is a connection between two sets of numbers in which each member of the first set (known as the domain) corresponds to a single element in the second set (called the range).

In other words, a function takes inputs from one set and produces outputs from another. Inputs are commonly represented by the variable x, whereas outputs are represented by the variable y.

A function can be described using an equation or a graph. The equation y = 2x + 1 represents a linear function in which each value of x yields a distinct value of y.v

a) Because time cannot be negative, the domain of the function g(t) is the set of all non-negative real numbers. As a result, the domain is [0, ].

Because the amount of gas in the tank cannot be negative or more than the tank's capacity. The range of the function g(t) is the set of all non-negative real numbers less than or equal to 23 (the maximum capacity of the tank).

We can graph the function g(t) by plotting points for different values of t and connecting them with a line. For instance, if we pick t = 0, g(0) = 23, we plot the point (0, 23). We plot the point if we select t = 1 and g(1) = 19.8. (1, 19.8).

c) We are informed that there are 6.4 gallons remaining at the end of the journey. As a result, g(t) = 6.4. We can solve for t by plugging this number into the equation for g(t):

[tex]6.4 = 23–3.2t 3.2t = 16.6 t = 5.1875 g(t) = 23–3.2t[/tex]

Therefore, the journey lasted 5.1875 hours.

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By using sample standard deviation - (1) N or n = 20

(2) X or μ = 43.4

(3) σ = 9.78 and s = 10.04

Why does sample standard deviation exist?

When we talk about a sample standard deviation, we're not talking about population standard deviation. The average amount by which a group of values deviates from their mean is shown by the statistical measure of variability known as the standard deviation.

We are given with the following data set below;

{51, 48, 42, 43, 48, 48, 46, 15, 29, 45, 47, 55, 46, 35, 47, 48, 54, 26, 53, 42}

(1) As we can see in the above data that there are 20 data values in our data set which means that the value of N or n (numner of observations) is 20.

(2) The formula for calculating Mean of the data, i.e. X or μ is given by;

       Mean  =  51 +48+ 42+ 43+ 48 + 48 + 46+ 15+ 29+ 45+ 47+ 55+ 46+ 35+ 47+ 48+ 54+ 26+ 53+ 42/20

                = 868/20 = 43.4

So, the value of  X or μ   is 43.4.

(3) The formula for calculating population standard deviation () is given by;

  Standard deviation, σ  = √(51 - 43.4)² + (48 - 43.4)² + .........+(42 - 43.4)²/20

        =  9.78

Similarly, the formula for calculating sample standard deviation (s) is given by;

       Sample Standard deviation, s =  

                       √(51 - 43.4)² + (48 - 43.4)² + .........+(42 - 43.4)²/20 - 1

                      =  10.04

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Answer:

To solve the quadratic equation 9×^2-15×-6=0, we can use the quadratic formula, which is given by:

x = (-b ± sqrt(b^2 - 4ac)) / 2a

where a, b, and c are the coefficients of the quadratic equation ax^2 + bx + c = 0.

In this case, a = 9, b = -15, and c = -6, so we can substitute these values into the quadratic formula:

x = (-(-15) ± sqrt((-15)^2 - 4(9)(-6))) / 2(9)

Simplifying this expression gives:

x = (15 ± sqrt(225 + 216)) / 18

x = (15 ± sqrt(441)) / 18

x = (15 ± 21) / 18

So the two solutions to the quadratic equation are:

x = (15 + 21) / 18 = 2

x = (15 - 21) / 18 = -1/3

Therefore, the solutions to the quadratic equation 9×^2-15×-6=0 are x = 2 and x = -1/3.

Given:-

To find:-

Answer:-

In the given right angled triangle, cosine is the ratio of base and hypotenuse. In this triangle with respect to angle H , IH is base, IJ is perpendicular and JH is hypotenuse. And their measures are ,

And as mentioned earlier, we can find cosH as ,

[tex]\implies\cos\theta =\dfrac{b}{h} \\[/tex]

[tex]\implies \cos H =\dfrac{IH}{HJ} \\[/tex]

On substituting the respective values, we have;

[tex]\implies\cos H = \dfrac{40}{41}\\[/tex]

[tex]\implies \cos H = 0.975 [/tex]

Value rounded to nearest hundred will be ,

[tex]\implies \cos H =\boxed{0.98}[/tex]

Hence the value of cos H 0.98 .

Answer:

cos H = 0.98 (rounded to the nearest hundredth)

Step-by-step explanation:

Answer:

[tex]\cos R=\dfrac{3}{5}[/tex]

Step-by-step explanation:

To find the cosine of an angle in a right triangle, we can use the cosine trigonometric ratio.

The cosine trigonometric ratio is the ratio of the side adjacent to the angle to the hypotenuse.

[tex]\boxed{\cos \theta=\sf \dfrac{A}{H}}[/tex]

From inspection of the given right triangle HIJ, the side adjacent to angle H is IH, and the hypotenuse is HJ. Therefore:

Substitute these values into the formula:

[tex]\implies \cos H=\dfrac{40}{41}[/tex]

As 41 is a prime number, the fraction cannot be reduced any further.

The value of cos H rounded to the nearest hundredth is:

[tex]\implies \cos H=0.975609756...[/tex]

[tex]\implies \cos H=0.98[/tex]

We can see that p(p + 1)(p − 1) is not always divisible by 7, but it is always divisible by 5, 4, and 3. Thus, the correct answer is (G) 5.

A positive integer is a whole number greater than zero. In other words, it is a number that can be written without any fractional or decimal components, and is larger than zero. Positive integers are commonly denoted by the symbol "N" or "Z+".

A negative integer is a whole number less than zero. In other words, it is a number that can be written without any fractional or decimal components, and is smaller than zero. Negative integers are commonly denoted by the symbol "Z−".

In the given question,

We can simplify p(p + 1)(p − 1) as follows:

p(p + 1)(p − 1) = p(p² - 1) = p³- p

Now, we can consider the remainders when p is divided by each of the answer choices:

F. 7: If p = 7, then p³- p = 7³ - 7 = 342, which is not divisible by 7.

G. 5: If p = 5, then p³ - p = 5³ - 5 = 120, which is divisible by 5.

H. 4: If p = 4, then p³ - p = 4³ - 4 = 60, which is divisible by 4.

J. 3: If p = 3, then p³ - p = 3³ - 3 = 24, which is divisible by 3.

Therefore, we can see that p(p + 1)(p − 1) is not always divisible by 7, but it is always divisible by 5, 4, and 3.

Thus, the correct answer is (G) 5.

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The equation connecting z and p is:

z = x + (1/p)

To find z when p = 6, we can use the values of x and y when p = 2 and p = 4 to calculate the corresponding value of z when p = 6.

When p = 2, x = 4 and y = 1, so z = 5

When p = 4, x = 16 and y = 0.25, so z = 16.25

Therefore, when p = 6, x = 36 and y = 0.167, so z = 36.167

two fractions with a common denominator of 8 can be expressed in the form of a/b and c/8, where a and c are integers. As long as a and c are not both multiples of 8  then these fractions would have a common denominator of 8.

A number that can be divided exactly by all of the denominators in a group of fractions is referred to as a common denominator. 2. A noun that counts. A trait or attitude that all members of a group share is known as a common denominator.

Since the two fractions have a common denominator of 8, they can be written in the form of a/b and c/8, where a and c are integers.

There are many possible combinations of integers that could satisfy this condition. Here are some examples:

1/8 and 3/8

2/8 (which simplifies to 1/4) and 6/8 (which simplifies to 3/4)

4/8 (which simplifies to 1/2) and 7/8

5/8 and 2/8 (which simplifies to 1/4)

3/8 and 4/8 (which simplifies to 1/2)

In general, any two fractions with a common denominator of 8 can be expressed in the form of a/b and c/8, where a and c are integers. As long as a and c are not both multiples of 8  then these fractions would have a common denominator of 8.

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The possible dimension of the canvas she could use for her paintings is 71.25 cm × 45 cm

The given dimensions of the mountain scenery in the calendar are 28.5 cm × 18 cm.

To make a painting similar to this scenery, Christina needs to use a canvas with the same aspect ratio as the mountain scenery in the calendar. Aspect ratio is the proportional relationship between the width and height of an image or object.

To find the aspect ratio of the mountain scenery in the calendar, we divide the width by the height:

aspect ratio = width / height = 28.5 cm / 18 cm = 1.5833

Now we can calculate the aspect ratio for each of the given canvas options by dividing the width by the height:

42.75 cm × 51 cm has an aspect ratio of 42.75 cm / 51 cm = 0.8382

14.25 cm × 36 cm has an aspect ratio of 14.25 cm / 36 cm = 0.3958

57 cm × 27 cm has an aspect ratio of 57 cm / 27 cm = 2.1111

71.25 cm × 45 cm has an aspect ratio of 71.25 cm / 45 cm = 1.5833

46 cm × 68 cm has an aspect ratio of 46 cm / 68 cm = 0.6765

Only the option 71.25 cm × 45 cm has the same aspect ratio (1.5833) as the mountain scenery in the calendar, so this is the correct answer.

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When rounded to two decimal places, the radius of the can is approximately 1.6 inches.

Surface fοrmed by a straight line mοving parallel tο a fixed straight line and intersecting a fixed planar clοsed curve. a sοlid οr surface defined by a cylinder and twο parallel planes that cut all οf its elements. See Vοlume Fοrmulas Table, particularly fοr the right circular cylinder.

The volume of a cylinder can be calculated using the following formula:

V = πr²h

where

V denotes volume,

r denotes radius, and

h denotes height.

The cylindrical aluminium can has a height of 7 inches and a volume of 56 cubic inches. We can calculate the radius using the volume of a cylinder formula:

V = πr²h

56 = πr²(7)

56 = (22/7)r²(7)

56 = 22r²

56/22 = r²

2.54 = r²

r = [tex]\sqrt{2.54}[/tex]

r ≈ 1.6

As a result, when rounded to two decimal places, the radius of the can is approximately 1.6 inches.

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Answer:

пошел в

Step-by-step explanation:

Step-by-step explanation:

remember the trigonometric triangle inside a circle.

sine is the up/down leg, cosine is the left/right leg.

the Hypotenuse (baseline) of the right-angled triangle is the angle-defining radius of the circle.

this is the basic definition inside the norm-circle with radius = 1.

for any other size sine and cosine need to be multiplied by the actual radius for the actual triangle side lengths.

I think you need the answer in simplified fraction and square root notification (you cut that off), but I give you also the decimal result, just in case.

so,

78 = cos(30)×y

78 = (sqrt(3)/2) × y

y = 78 / (sqrt(3)/2) = 2×78/sqrt(3) = 156/sqrt(3) =

= 90.06664199...

x = sin(30) × y = 0.5 × 156/sqrt(3) = 78/sqrt(3) =

= 45.033321...

Jack needed 7 7/8 pounds of flour for his batch of cookies.

Define Pounds

"Pounds" is a unit of measurement for weight, commonly used in the United States and other countries that have adopted the imperial system of measurement. One pound is equal to 16 ounces, and there are 2.20462 pounds in one kilogram.

Mary used 2 1/4 pounds of flour for her batch of cookies.

finding out how much flour Jack needed, we first need to determine how many cookies Jack made.

Since Jack made 3 1/2 times the amount of cookies that Mary made, we can calculate:

Number of cookies Jack made = 3.5 x Number of cookies Mary made

Let's start by finding out how much flour Mary used per cookie:

2 1/4 pounds of flour / Number of cookies Mary made

So, if Mary made X cookies, Jack made 3.5X cookies.

Now we can set up an equation:

2 1/4 pounds of flour / X cookies = Amount of flour per cookie

Amount of flour per cookie x Number of cookies Jack made = Total amount of flour Jack needed

Amount of flour per cookie = 2 1/4 pounds of flour / X cookies

Number of cookies Jack made = 3.5X

Total amount of flour Jack needed = Amount of flour per cookie x Number of cookies Jack made

Total amount of flour Jack needed = (2 1/4 pounds of flour / X cookies) x (3.5X cookies)

Total amount of flour Jack needed = 7 7/8 pounds of flour

Therefore, Jack needed 7 7/8 pounds of flour for his batch of cookies.

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The value of the integral is (81/2) for method 1, (95/2) for method 2, and (375/2) for method 3.

To evaluate the integral (xz − y^3) dV over the region E = {(x, y, z) : −1 ≤ x ≤ 3, 0 ≤ y ≤ 2, 0 ≤ z ≤ 6}, we can use three different orders of integration

Method 1

Integrating with respect to x first

In this method, we integrate with respect to x first, then with respect to y, and finally with respect to z.

∫∫∫ (xz − y^3) dV = ∫0^6 ∫0^2 ∫−1^3 (xz − y^3) dx dy dz

= ∫0^6 ∫0^2 [(1/2)x^2z − xy^3]∣−1^3 dy dz

= ∫0^6 [4z − (27/2)z] dz

= (3/2) ∫0^6 z dz

= (81/2)

Method 2

Integrating with respect to y first

In this method, we integrate with respect to y first, then with respect to x, and finally with respect to z.

∫∫∫ (xz − y^3) dV = ∫0^6 ∫−1^3 ∫0^2 (xz − y^3) dy dx dz

= ∫0^6 ∫−1^3 [(1/2)xz y^2 − (1/4)y^4]∣0^2 dx dz

= ∫0^6 [(8/3)xz − (81/4)] dz

= (95/2)

Method 3

Integrating with respect to z first

In this method, we integrate with respect to z first, then with respect to x, and finally with respect to y.

∫∫∫ (xz − y^3) dV = ∫−1^3 ∫0^2 ∫0^6 (xz − y^3) dz dy dx

= ∫−1^3 ∫0^2 [(1/2)xz^2 − y^3z]∣0^6 dy dx

= ∫−1^3 [(54/2)x − (32/3)] dx

= (375/2)

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The largest couple M that can be applied  to the cross-section of beam  is 108.23 kN.m.

To determine the largest couple M that can be applied to the cross-section shown, we need to calculate the maximum shear stress in the cross-section and ensure that it is less than the allowable stress of the material.

The cross-section can be divided into two rectangles, and the centroid of the combined shape can be found to be at a distance of 2.5 mm from the top edge and 7.5 mm from the left edge. Using the formula for maximum shear stress, τ = VQ/It, we can find the maximum shear stress as:

V = M*d/A, where d is the distance from the neutral axis to the outermost fiber, and A is the area of the cross-section.

d = 5 mm + 2.5 mm = 7.5 mm

A = (10 mm * 5 mm) + (5 mm * 5 mm) = 75 mm^2

Therefore, V = (M*7.5)/75 = M/10

The second moment of area (I) of the combined shape can be found by summing the second moments of area of the two rectangles about their centroids:

I = (1/12 * 10 mm * (5 mm)^3) + 10 mm * (2.5 mm - 7.5 mm)^2 + (1/12 * 5 mm * (5 mm)^3) + 5 mm * (7.5 mm - 2.5 mm)^2

I = 8541.67 mm^4

The elastic modulus of the material is assumed to be constant and is equal to 200 GPa.

Using these values, we can find the maximum shear stress as:

τ = (M7.5)/(108541.67) * (10/5) = M/916.28 MPa

The maximum allowable stress is given as 118 MPa, so we set τ = 118 MPa and solve for M:

M/916.28 = 118 MPa

M = 108227.68 N.mm = 108.23 kN.m (rounded to two decimal places)

Therefore, the largest couple M that can be applied is 108.23 kN.m.

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_____The given question is incomplete, the complete question is given below:

Consider a beam with the cross section shown, made of a material with an allowable stress of 118 MPa. 10 mm 10 mm 801111n- 5mm 5 mm References eBook & Resources Section Break Difficulty: Easy 2· value: 10.00 points Determine the largest couple M that can be applied to the cross section shown. (Round the final answer to two decimal places.) The largest couple M that can be applied is kN m.

The expected value of the given data is 3.2.

The expected value of a discrete random variable is the weighted average of its possible values, where the weights are their respective probabilities. Thus, the expected value of X is given by

E(X) =[tex]1*0.1 + 2*0.2 + 3*0.3 + 4*0.2 + 5*0.2\\ = 0.1 + 0.4 + 0.9 + 0.8 + 1\\ = 3.2[/tex]

Therefore, the expected value of X is 3.2, rounded to one decimal place.

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Answer:

20

Step-by-step explanation:

Answer:

What is the Value of Tan 270 Degrees? The value of tan 270 degrees is undefined. Tan 270 degrees can also be expressed using the equivalent of the given angle (270 degrees) in radians (4.71238 . . .) ⇒ 270 degrees = 270° × (π/180°) rad = 3π/2 or 4.7123 . . .

please marke a a brainalist pls

Answer:

What are the zeros of the function f(x)= 240x -2x^2

Step-by-step explanation:

To find the zeros of the function f(x) = 240x - 2x^2, we need to set f(x) equal to zero and solve for x:

240x - 2x^2 = 0

We can factor out 2x from the left side:

2x(120 - x) = 0

So either 2x = 0 or 120 - x = 0. Solving for x in each case gives:

2x = 0 => x = 0

120 - x = 0 => x = 120

Therefore, the zeros of the function are x = 0 and x = 120.

In the word problem,

a)Gallons per minute change is -2/3 gallons per minute

b) 7.5 minutes to drain the other 5 gallons

c)The tank was full 4 1/2 minutes before Jada arrived.

What is word problem?

Word problems are often described verbally as instances where a problem exists and one or more questions are posed, the solutions to which can be found by applying mathematical operations to the numerical information provided in the problem statement. Determining whether two provided statements are equal with respect to a collection of rewritings is known as a word problem in computational mathematics.

a) Gallons per minute change is -2/3 gallons per minute  since it decreases by 2 gallons in 3 minutes.

b)  we have 5 gallons and lose 2/3 gallons per minute

=> (2/3 gal/minute)(x minutes) = 5 gallons

=> x = 5(3/2) = 15/2 = 7.5 minutes to drain the other 5 gallons

c)  There was 10 gallons when the tank is full . That is 3 gallons more than the 7 gals there when Jada arrived.

=>  (2/3)(x) = 3

=> x = 3(3/2) = 9/2 = 4 1/2 minutes

The tank was full 4 1/2 minutes before Jada arrived.

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To find the eigenvalues and eigenvectors of a matrix, we need to solve the equation Ax = λx, where A is the matrix, λ is the eigenvalue, and x is the eigenvector. In this case, we have a 3x3 matrix, so we expect to find three eigenvalues and three eigenvectors.

Without performing the calculations, it is difficult to determine the exact eigenvalues and eigenvectors of matrix D. However, based on the structure of the matrix, we can make some observations. We notice that the matrix has a repeating pattern of the number 5, which suggests that 5 is a dominant eigenvalue. Additionally, the matrix is symmetric, so we know that the eigenvectors will be orthogonal.

One possible approach to finding the eigenvectors is to use the Gram-Schmidt process, which is a method for orthogonalizing a set of vectors. We can start with a vector that is parallel to one of the columns of the matrix, and then subtract the projection of that vector onto the next column to obtain a vector that is orthogonal to the first. We can continue this process for each column to obtain a set of orthogonal vectors, which will be our eigenvectors.

Based on these observations, we can hypothesize that 5 is an eigenvalue of D and that we can find two linearly independent eigenvectors by using the Gram-Schmidt process on the columns of the matrix. However, we would need to perform the calculations to confirm this hypothesis and determine the exact values of the eigenvectors.

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According to the Mean Value Theorem, if f(x) is a function that is continuous on the closed interval [a, b] and differentiable on the open interval (a, b), then there exists at least one c in (a, b) such that:

f(b) - f(a) = f'(c) x (b - a)

To find a c that satisfies the theorem, we need to solve for c:

c = (f(b) - f(a)) / (b - a) / f'(c)

However, this equation cannot be solved directly because c appears on both sides. Instead, we can use an iterative numerical method to approximate c.

One such method is the bisection method, which involves repeatedly dividing the interval (a, b) in half and checking which subinterval contains a root. Here's how it works:

1. Set c = (a + b) / 2, the midpoint of the interval.

2. Evaluate f'(c) using the derivative of f.

3. Calculate f(b) - f(a) and f'(c) x (b - a).

4. If f'(c) x (b - a) = f(b) - f(a), then c is the solution.

5. If f'(c) x (b - a) > f(b) - f(a), then the solution is in the left subinterval (a, c), so set b = c and go to step 1.

6. If f'(c) x (b - a) < f(b) - f(a), then the solution is in the right subinterval (c, b), so set a = c and go to step 1.

Repeat steps 1-6 until the solution is found to a desired degree of accuracy.

Note that this method assumes that f'(x) is continuous on [a, b], which is not always the case. In such cases, other numerical methods may be required.

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The displacement of the block at any time t is then x= 0.05cos5tm. (option b).

Now, when the block is released, it starts oscillating back and forth about its equilibrium position due to the force exerted by the spring. This motion is described by the equation of motion for a simple harmonic oscillator:

x = Acos(ωt + φ)

The angular frequency ω of the oscillation is given by:

ω = √(k/m)

where k is the spring constant and m is the mass of the block.

Substituting the given values of k and m, we get:

ω = √(50/2) = 5 rad/s

The phase angle φ depends on the initial conditions of the system, i.e., the initial displacement and velocity of the block. Since the block is initially at rest, its initial velocity is zero and the phase angle is zero as well.

Therefore, the equation of motion for the displacement of the block is:

x = 0.05cos(5t)

Hence, option B, x = 0.05cos(5t), is the correct answer.

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The process to show that if 16 people are seated in a row of 20 chairs, then some group of 4 consecutive chairs must be occupied is shown below.

We prove this using the Pigeonhole Principle, which states that if n items are placed into m containers, and n > m, then at least one container must contain more than one item.

Let us consider the 16 people seated in a row of 20 chairs. Each person occupies one chair, so there are 20 - 16 = 4 empty chairs in the row.

We assume that empty chairs as containers, and people as items that need to be placed into containers.

Since there are more items (people) than containers (empty chairs), there must be at least one group of 2 or more consecutive empty chairs.

Now, let's consider the complement of this statement: Suppose there are no groups of 4 consecutive chairs that are occupied. Then, each group of 4 consecutive chairs contains at most 3 people.

We partition the row of chairs into groups of 4 consecutive chairs.

So, there are 20 - 3 = 17 such groups. By the statement above, each of these groups contains at most 3 people. Therefore, the total number of people seated in the row is at most 17×3 = 51.

But, we know that there are actually 16 people seated in the row. This is a contradiction, since 51 < 16. Therefore, our assumption that there are no groups of 4 consecutive chairs that are occupied must be false, and we have proved that some group of 4 consecutive chairs must be occupied.

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Step-by-step explanation:

this is solution which is given above in photo

The largest interval which includes x=0 for which the given initial value problem has a unique solution is (-∞,4).

The Differential Equation is : (x-4)y'' + 2y = x,

Now, we convert the differential-equation into the standard form,

We get,

⇒ y'' + 2y/(x-4) = x/(x-4)     ...equation(1)

We know that second order differential-equation is :

⇒ ay'' + by' + cy = R   ...equation(2),

Now, On comparing equation(2) with equation(1),

we get,

The values are : a = 1, b = 0 and c = 2/(x-4), R = x/(x-4),

The Values of "c" , "R" are continuous except at the value "4" because on substituting 4 in x of c and x of R the values of c and R approaches to ∞.

Therefore, The largest-interval which includes x=0 is (-∞,4).

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To show that the finite union of compact sets is compact, we need to show that any open cover of the union has a finite subcover.  

Let A and B be two compact sets. Suppose that U is an open cover of A ∪ B. also U is also an open cover of A and an open cover ofB.   Since A is compact, there exists a finite subcover of U that coversA. Let this subcover be{ U1, U2,., Un}.   also, since B is compact, there exists a finite subcover of U that coversB. Let this subcover be{ V1, V2,., Vm}.  

Also the union of these two finite subcovers is a finite subcover of U that covers A ∪B. Specifically, the subcover is{ U1, U2,., Un, V1, V2,., Vm}.   thus, any open cover of the finite union of compact sets A ∪ B has a finite subcover, and  therefore A ∪ B is compact. By induction, we can extend this result to any finite union of compact sets.

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