8th Grade Math Homework (Please Help)

The number of times two yellow cards occurred in 400 simulations of the repeated experiment. will be 64.

The probability of getting yellow is calculated as,

P(YY) = 2/5 x 2/5

P(YY) = 4/25

The expected value is given below.

E(x) = np

Where n is the number of samples and p is the probability.

The expected value is calculated as,

E(YY) = 400 x 4/25

E(YY) = 64

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The z-score for the raw score of 39 is 1.The z-score for the raw score of 30 is -0.8.Z-scores measure the number of standard deviations a raw score is from the mean. A positive z-score indicates a raw score above the mean, while a negative z-score indicates a raw score below the mean.

To find the z-scores, we need to use the formula:

z = (x - μ) / σ

where:

z is the z-score,x is the raw score,μ is the mean, andσ is the standard deviation.

Let's calculate the z-scores for the given mean of 34 and standard deviation of 5.For a raw score of 39:

z = (39 - 34) / 5

z = 5 / 5

z = 1

So, the z-score for the raw score of 39 is 1.For a raw score of 30:

z = (30 - 34) / 5

z = -4 / 5

z = -0.8

The z-score for the raw score of 30 is -0.8.

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The ratio of literature books to children books is: a) 4 literature books: 1 children book.

Ratio is simply the numerical quantity that relates two amounts of quantities, showing how much one contains of the other.

The ratio of literature books to children books can be found by dividing the number of literature books by the number of children books:

Ratio of literature books to children books = Number of literature books / Number of children books

Plugging in the given values, we get:

Ratio of literature books to children books = 400 / 100 = 4

So the ratio of literature books to children books is 4:1. Therefore, the answer is option a) 4 literature books: 1 children book.

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Symmetry means,  hmmm usually a mirror image.

So when something is symmetry to another, is a way to say, one is the mirror image of the other, or namely they're just identical twins.

Now, if know that B is the midpoint, by definition is cutting AC into two equal halves, so AB is the mirror image of BC, so they're identical twins, there are no flaws, Q.E.D.

Check the picture below.

The height of the beaker is 6.35 cm.

To find the height of the beaker, we can use the formula for the volume of a cylinder, which is given by:

Volume = π ×[tex]radius^2[/tex] × height

In this case, we have the volume of the beaker as 1,004.8 cubic centimeters and the radius as 4 cm.

1,004.8 = π × [tex]4^2[/tex] × height

Simplifying the equation:

1,004.8 = 16π × height

To solve for the height, divide both sides of the equation by 16π:

height = 1,004.8 / (16π)

Using a calculator for the approximation of π (pi) as 3.14159, we can calculate the height:

height ≈ 1,004.8 / (16 × 3.14159)

height ≈ 6.35 cm

The height of the beaker is approximately 6.35 cm.

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With regard to Neotraditionism, Denis' influence to write the first state  what was not objective comes from the desire to "put an end to all kind of naturalism and illusion" "Purely Plastic Art"

In order to create truly original works of art that went beyond what they saw as stagnating traditions of representation and illusionism both Denis and Kandinsky had their own unique visions for what constituted true artistic expression

Denis wanted to create a "purely plastic art" that would transcend nature altogether (Denis, 1890).

While Kandinsky believed that color held within it an almost mystical power capable of evoking deep emotions: "Color is...the soul is...the artist is..." he wrote poetically (p. 44).

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Answer:

24 years old.

Step-by-step explanation:

Let's say that Elga's age is x years old. Then Alvin's age would be 11 years older than Elga, or x + 11 years old.

We know that the sum of their ages is 59 years old, so we can write an equation:

x + (x + 11) = 59

Simplifying the left side of the equation:

2x + 11 = 59

Subtracting 11 from both sides:

2x = 48

Dividing both sides by 2:

x = 24

Therefore, Elga's age is 24 years old.

Answer: 24

Step-by-step explanation:

Set Elga's age to x and Alvin's age to x+11...

(x+11)+x=59

2x=48

x=24

The set of ordered pairs above: is a function.

The mapping diagram above: is a function.

y = x²: is a function.

The table above: is not a function.

In Mathematics and Geometry, a function is a mathematical equation which is typically used for defining and representing the relationship that exists between two or more variables such as an ordered pair.

Based on the set of ordered pairs, mapping diagram, and the equation above, we can reasonably infer and logically deduce that it represent a function because the input values (domain, x-value, or independent values) are uniquely mapped to the output values (range, y-value or dependent values).

In this context, we can reasonably infer and logically deduce that the table does not represent a function because the input value (-1) has more than output values (2 and 4 respectively).

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Answer:

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

The range of the data is the difference of maximum and minimum values.

According to description of the box plot, the minimum value is 6 and maximum value is 18.

Hence the range is:

Answer:

48

Step-by-step explanation:

Volume of triangular prism =1/2 bhl

=1/2 (4cm)(6cm)(4cm)

=48

The slope (m) and y-intercept (b) with the equation of the line in slope-intercept form are given as: m = 2 and b = 5 is y = 2x + 5; m = 3 and b = 5 is y = 3x + 5; m = 5 and b = 4 is y = 5x + 4.

If m represents the slope of a line and b represents its y-intercept, the equation of the line in slope-intercept form is written as: y = mx + b.

Where m = 2 and b = 5, the equation of the line would be expressed as: y = 2x + 5.

Where m = 3 and b = 5, the equation of the line would be expressed as: y = 3x + 5.

Where m = 5 and b = 4, the equation of the line would be expressed as: y = 5x + 4.

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Answer:

26 units

Step-by-step explanation:

AD = 9 -2 = 7 units long. BC is the same. so we have 2 X 7 = 14.

DC is 9 - 3 = 6 units long. AB is the same. so we have 2 X 6 = 12.

perimeter = 14 + 12 = 26 units

The surface area of the box which is a rectangular prism would be = 24 square inches. That is option D.

To calculate the area of the given box the formula that should be used is the formula of the area of a rectangular prism. That is;

Area of rectangular prism = length×width×height

Where:

length = 4 inches

width = 3 inches

height = 2 inches

Area = 4×3×2 = 24 square inches

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Answer:

-9

Step-by-step explanation:

The circumference of a circle with a radius of 21 centimeters is 132 centimeters.

The circumference is the distance around the boundary of a closed curve or shape. In the case of a circle, the circumference is the total length of the circular boundary.

To find the circumference of a circle with a radius of 21 centimeters, we can use the formula C = 2πR, where R is the radius and π is the mathematical constant approximately equal to 22/7.

Substituting the given values:

C = 2 x (22/7) x 21

C = (44/7) x 21

C = 924/7

C ≈ 132 centimeters

Therefore, the circumference of a circle with a radius of 21 centimeters is 132 centimeters.

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The probability of obtaining a success given that X is less than 5, P(X < 5) is 0.8906.

The probability of obtaining a success is calculated as follows:

Given data:

X has a binomial distribution with n = 6 trials and p = 0.5, the probability of obtaining a success.

Using the binomial distribution function:

P(X < 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4)

P(X = k) = [tex](_nC_k) * p^{k} * (1 - p)^{(n - k)}[/tex]

Therefore;

P(X < 5) = (₆C₀) * 0.5⁰ * 0.5⁶ + ( 1) * 0.5¹ * 0.5⁵ + (₆C₂) * 0.5² * 0.5⁴ + (₆C₃) * 0.5³ * 0.5³ + (₆C₄) * 0.5⁴ * 0.5²

P(X < 5) = 0.015625 + 0.09375 + 0.234375 + 0.3125 + 0.234375

P(X < 5) = 0.8906

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Answer:

x = 65 degrees

Step-by-step explanation:

The sum of all 4 interior (inside) angles in a quadrilateral = 360.

So 82+118+95+x = 360.

295+x = 360

x = 360-295

x = 65

Check that all the angles add up to 360:

82+118+95+65 = 360

A linear model that shows the miles Martin has run as the input, and the total time, in minutes, he has been running as the output is: y = 11x - 5

The general formula for the equation of a line between two coordinates is:

(y - y₁)/(x - x₁) = (y₂ - y₁)/(x₂ - x₁)

Using the coordinates as:

(5, 60), (9, 104) and (20, 225), we can say that the equation is expressed as:

(y - 60)/(x - 5) = (104 - 60)/(9 - 5)

(y - 60)/(x - 5) = 44/4

y - 60 = 11(x - 5)

y - 60 = 11x - 55

y = 11x - 5

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The expression that represent the perimeter of the triangle is 3d² - 4d + 1.

The perimeter of any two-dimensional figure is simply the distance around the figure.

Hence, the perimeter of the triangle is the sum of all its 3 side lengths.

From the diagram:

Side length 1 = ( d² + 3 )

Side length 2 = ( 4d² + 3d - 2 )

Side length 3 = ( -2d² - 7d )

Hence, the perimeter of the triangle will be:

Perimeter = side length 1 + side length 2 + side length 3

Plug in the expressions

Perimeter = ( d² + 3 ) + ( 4d² + 3d - 2 ) + ( -2d² - 7d )

Collect and add like terms:

Perimeter = d² + 3 + 4d² + 3d - 2 + -2d² - 7d

Perimeter = d² + 4d² - 2d² + 3d - 7d + 3 - 2

Perimeter = 3d² - 4d + 1

Therefore, the perimeter is 3d² - 4d + 1.

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The point estimate is given as 0.4688

The standard error = 0.051

P = x / n

= 45 / 96

= 0.4688

The point estimate is given as 0.4688

How to solve for the standard error

SE = √[ p(1 - p) / n ]

Substituting the values we have:

SE = √[ 0.46875 * (1 - 0.46875) / 96 ]

= √[ 0.2482 / 96 ]

The standard error = 0.051

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Question

For the given confidence level and values of x and n, find the following.

=x45, =n96, confidence level 95% find the point estimate and the standard error

The correct interpretations of the slope and y-intercept are:

For each increase in speed of 1 mph, an additional 46.4 calories are predicted to be burned.

About 71.9 calories are burned at rest.

These interpretations are based on the regression equation given as

ŷ = 71.9 + 46.4x,

where ŷ represents the predicted calories burned and x represents the speed in miles per hour.

The slope of 46.4 indicates that for each 1 mph increase in speed, there is an additional predicted burn of 46.4 calories.

The y-intercept of 71.9 suggests that at a speed of 0 mph (resting), approximately 71.9 calories are burned.

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The solution is:

[tex]\int\limits^a_b {\frac{x^{3} }{x^{2} + x -2 } } \, dx[/tex] =[tex]ln|x| + \frac{2}{5} ln|x+2| + \frac{1}{3} ln|x-1| + C[/tex]

The partial fraction expansion of a rational fraction is  described as an operation that consists of expressing the fraction as a sum of a polynomial and one or several fractions with a simpler denominator.

To solve the above partial fraction decomposition,

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

we then write the fraction as a sum of partial fractions:

[tex]fx-2dx = \frac{A }{x } + \frac{B}{x + 2 } + \frac{C }{x - 1}[/tex]

We  find the values of A, B, and C by  multiplying  both sides by the common denominator (x)(x+2)(x-1) and  substituting

fx-2dx = A(x+2)(x-1) + B(x)(x-1) + C(x)(x+2)

We set  x = 0

0 = -2A

A = 0.

We set  x = -2

-2 = 20B/(-2)(-4)

-2 = -5B

B = 2/5.

we set  x = 1

1 = 3C

C = 1/3.

fx-2dx = 0/x +  2/5/(x+2) +  1/3/(x-1)

We integrate each term separately and have the solution as :

[tex]\int\limits^a_b {\frac{x^{3} }{x^{2} + x -2 } } \, dx[/tex] =[tex]ln|x| + \frac{2}{5} ln|x+2| + \frac{1}{3} ln|x-1| + C[/tex].

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[1st Picture] Answer: x = 3.98

Step-by-step explanation:

    We are given the opposite side and adjacent side from our reference angle. This will use the tangent function. tanθ = [tex]\frac{opposite}{adjacent}[/tex].

tan(53°) = [tex]\frac{x}{3}[/tex]

3tan(53°) = x

x = 3.98

[2nd Picture] Answer: x = 3.13

Step-by-step explanation:

    Here, we are given the opposite side from our reference angle and the hypotenuse. This will use the sine function. sinθ = [tex]\frac{opposite}{hypotenuse}[/tex].

sin(23°) = [tex]\frac{x}{8}[/tex]

8sin(23°) = x

x = 3.13

[3rd Picture - #6] Answer: θ = 63.4°

Step-by-step explanation:

    Again, we are given the opposite side from our reference angle and the hypotenuse. This will use the sine function. sinθ = [tex]\frac{opposite}{hypotenuse}[/tex]. To find the angle measurement of theta at the end, we will use the inverse of sine.

sin(θ) = [tex]\frac{6}{6.71}[/tex]

[tex]sin^{-1}[/tex](sin(θ)) = [tex]sin^{-1}[/tex]([tex]\frac{6}{6.71}[/tex])

θ = 63.4°

The first time that Account X will have more money than Account W, excluding the initial deposits, is in the fifth month.

To determine when Account X will contain more money than Account W, we need to compare the balances of the two accounts each month until Account X surpasses Account W.

Let's analyze the balances of the two accounts month by month:

Month 1:

Account W: $0 + $100 = $100

Account X: $1 + 80% × $1 = $1 + $0.80 = $1.80

Month 2:

Account W: $100 + $100 = $200

Account X: $1.80 + 80% × $1.80 = $1.80 + $1.44 = $3.24

Month 3:

Account W: $200 + $100 = $300

Account X: $3.24 + 80% × $3.24 = $3.24 + $2.592 = $5.832

Month 4:

Account W: $300 + $100 = $400

Account X: $5.832 + 80% × $5.832 = $5.832 + $4.6656 = $10.4976

Month 5:

Account W: $400 + $100 = $500

Account X: $10.4976 + 80% × $10.4976 = $10.4976 + $8.39808 = $18.89568

Please note that the values provided in this calculation assume no withdrawals and no interest earned on the balances.

As we can see, by the fifth month, Account X will contain more money than Account W. The first time that Account X will have more money than Account W, excluding the initial deposits, is in the fifth month.

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The length and width of another rectangular park is 110 meters by 65 meters

From the question, we have the following parameters that can be used in our computation:

A rectangular park is 70 meters wide and 105 meters long

This means that

Width = 70

Length = 105

The area is calculated as

Area = 70 * 105

Area = 7350

For smaller area, we decrease the width and increse the length

So, we have

Width = 70 - 5

Length = 105 + 5

Evaluate

Width = 65

Length = 110

Hence, the length and width of another rectangular park is 110 by 65

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By rewriting the 3 given systems, we will see that:

1) Independent and inconsistent.

2) Independent and consistent.

3) Independent and inconsistent..

Let's analyze each system.

Let's look at the first one, we can rewrite it as:

y = 3x - 1

And, 2y - 6x = 4

2y = 6x + 4

y = 3x + 2

Here both lines have the same slope, so the lines never do intersect, meaning that the system is inconsistent and independent.

Now let's look at the second system, we can rewrite it as:

2y = - x + 6

And, 4y + 2x = 12

y = - 1/2x + 3

So, the slopes are different, meaning that we have one solution, so this system is consistent and independent.

For the final system we have:

y = 2x + 3

x + y = - 9

So, the slopes are different, meaning that we have one solution, so this system is consistent and independent.

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The book has a lower cost per minute than the movie.

To find the cost per minute of the book, we divide the cost by the number of minutes:

cost per minute of book = $15 / 200 minutes = $0.075 per minute

To find the cost per minute of the movie, we need to convert the time to minutes.

2 hours and 39 minutes is equal to:

2 hours x 60 minutes/hour = 120 minutes

39 minutes = 39 minutes

Total minutes = 120 + 39 = 159 minutes

cost per minute of movie = $14 / 159 minutes = $0.088 per minute

Therefore, the book has a lower cost per minute than the movie.

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