anyone know this? 8th grade math

a) The sampling method used is non-probability sampling.

b) The sample is going to be representative.

What is sampling?

Sampling is a technique for choosing certain individuals or a small portion of the population in order to draw conclusions about the population as a whole and estimate its characteristics. Researchers frequently utilise various sampling techniques in market research so they do not have to study the full community in order to gather useful information.

In non-probability sampling, participants are chosen at random by the researcher. This type of sampling is not a set or predetermined selection procedure. This makes it challenging for every component of the population to have an equal chance of being included in a sample.

The sampling method used in non-probability sampling as the people selected are selected on a convenience basis.

A representative sample is a subset of a population that seeks to accurately reflect the characteristics of the larger group.

Since, the students are chosen randomly but from the same room of the same school they might represent the characteristics of all other students.

Therefore, the sample is representative.

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Quantity described by the given equations are as follow :

1. ( 1/2)at² represents the option a. position.

2. x /t represents the option b.  velocity.

3. vt represents the option a. position.

4. at represents the option b. velocity.

Description of the equations as per the mentioned quantity are given by :

Here 'x' represents the position , 'v' represents the velocity,

'a' represents the acceleration , 't' is the time.

1. ( 1/2)at²

Unit of acceleration 'a' is m/sec² , time 't' is sec.

Simplified unit of ( 1/2)at² is m which represents position 'x'.

2. x /t

Unit of position 'x' is m, time 't' is sec.

Simplified unit of ( x/t) is m/sec which represents velocity 'v'.

3. vt

Unit of velocity 'v' is m/sec , time 't' is sec.

Simplified unit of vt is m which represents position 'x'.

4. at

Unit of acceleration 'a' is m/sec² , time 't' is sec.

Simplified unit of ( at ) is m/sec which represents velocity 'v'.

Therefore, the description of all the quantities in the equations are:

1. ( 1/2)at² is option a. position.

2. x /t is option b.  velocity.

3. vt is option a. position.

4. at is option b. velocity.

The above question is incomplete , the complete question is:

consider the following equations, where x is a position, v is a velocity, a is an acceleration, and t is a time. using dimension analysis, find what quantity is described by the equation?

1. ( 1/2)at²

a. Position       b. velocity           c. Acceleration         d . None of these

2. x/t

a. Position       b. velocity           c. Acceleration         d . None of these

3. vt

a. Position       b. velocity           c. Acceleration         d . None of these

4.at

a. Position       b. velocity           c. Acceleration         d . None of these

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The reduced integral form of the equation x = 4 tan θ is 4ln|sec x| + C

The term integral is referred as the process to make use of different simplification methods depending upon the type of the integrand.

Here we have the equation x = 4 tan θ

Here in this problem, we have to make use of the substitution method to simplify the integrals.

Here we have to apply these value on the integral form then we get,

=> ∫x dx

=> ∫4 tan θ dθ

As we all know that when we integrate we get the resulting value as,

Here the number 4 is a constant, so it can be written as,

=> 4  ∫tan θ dθ

Then the resulting value is written as,

=> 4ln|sec x| + C

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Answer: 32.= m2 :62;24

Step-by-step explanation: that is the answer to this quitoon

An expression to represent how much larger the perimeter of the first rectangle is than the second rectangle is; 2x + 20

We are given the algebraic expressions showing the perimeter for the two rectangles as;

P = 5x +18

P = 3x - 2

Now, since the first perimeter is much larger than the perimeter of the second rectangle, then we can say that;

The difference in perimeter = (5x + 18) - (3x - 2)

= 2x + 20

That expression represents the amount by which the perimeter is larger as requested in the question.

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Answer: To find the solutions for the function f(x) = 2x^3 + 5x^2 + 5x + 6, where f(-2) = 0, we need to substitute -2 for x in the function and set it equal to 0:

f(-2) = 2(-2)^3 + 5(-2)^2 + 5(-2) + 6 = 0

Simplifying this equation, we get:

8 - 20 - 10 + 6 = 0

We then proceed to factor the polynomial:

2x^3 + 5x^2 + 5x + 6 = (2x + 3)(x+1)(x+2) = 0

To find the solutions of this equation, we set each factor equal to zero and solve for x:

2x + 3 = 0 => x = -3/2

x + 1 = 0 => x = -1

x + 2 = 0 => x = -2

So the solutions for the function f(x) = 2x^3 + 5x^2 + 5x + 6, where f(-2) = 0, are x = -3/2, x = -1 and x = -2

Step-by-step explanation:

The requried expression that represents a 95% confidence interval for the slope of the least squares regression line is:

b₁ ± t₁-α/2, n-2 * se(b₁)

To calculate a 95% confidence interval for the slope of the least squares regression line, we can use the following formula:

95% C.I. for β₁: b₁ ± t₁-α/2, n-2 * se(b₁)

where:

b₁ = Slope coefficient is shown in the regression table.

t₁-α/2, n-2 = The t critical value for confidence level 1-α with n-2 degrees of freedom where n is the total number of observations in our dataset.

se(b1) = The standard error of b₁ shown in the regression table.

Given that all conditions for inference are met, we can use the output of the linear regression analysis to find the values of b1 and se(b1) and then use a t-distribution table to find the t critical value for a 95% confidence level with 20 degrees of freedom (22-2).

The given options do not provide the values of b1 and se(b1), so we cannot calculate the confidence interval using them. However, we can use the formula and the information provided in the search results to understand how to calculate the confidence interval for the slope of the least squares regression line.

Therefore, the expression that represents a 95% confidence interval for the slope of the least squares regression line is:

b₁ ± t₁-α/2, n-2 * se(b₁)

where b₁ and se(b₁) are the slope coefficient and the standard error of the slope coefficient, respectively, obtained from the regression table, and t₁-α/2, n-2 is the t critical value for a 95% confidence level with n-2 degrees of freedom, obtained from a t-distribution table.

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Answer:

marginal revenue = $21

Monopolistic competition is a market structure where many firms sell differentiated products. The monopolistic  competitive firm maximizes profits where marginal revenue is above or equals to marginal cost. Profit is maximum at an output of 4 units. When the output is 4 units, marginal revenue is $21 and marginal cost is $7.  

The solution to the given inequality is y<3.

Inequalities are the mathematical expressions in which both sides are not equal. In inequality, unlike in equations, we compare two values. The equal sign in between is replaced by less than (or less than or equal to), greater than (or greater than or equal to), or not equal to sign.

The given inequality is 18+3y<27.

Here, subtract 18 on both the sides of an inequality, we get

3y<9

Divide 3 on both the sides of an inequality, we get

y<3

Therefore, the solution to the given inequality is y<3.

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Answer:  One-third the sum of negative fifty-four and fifteen is -15.

Step-by-step explanation:

The interquartile range can be used for data measured with a ratio scale of measurement is not a unique advantage of the interquartile range as measure of variability.

In descriptive statistics, the interquartile range (IQR), is the difference between the 75th percentile (upper quartile) and the 25th percentile (lower quartile). In other words, the IQR is the third quartile minus the first quartile. The quartiles can be identified clearly through a line box diagram.

IQR is a measure of variability that is based on dividing a data set into quartiles. Quartiles divide an ordered data set into four equal parts. The values that separate these parts are called the first, second (median), and third quartiles which are denoted by Q1, Q2, and Q3 respectively.

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Note that the vertical rise of the included plane is 519.35 ft. This is arrived at by the use of the knowledge of Trigonometric Identities.

Trigonometric Identities are equalities that utilize trigonometry functions and hold true for all variables in the equation. There are several trigonometric identities relating the side length and angle of a triangle.

Since the Johnstown Inclined Plane in Pennsylvania is known to be one of the world's longest and steepest hoists. The railway trains traverse 896.5 feet at an inclination of around 35.4 degrees, reaching a height of 1693.5 feet above sea level.

Because the slope's length is 896.54 feet and its inclination is 35.4 degrees, let h be the vertical rise of the incline. Based on trigonometric identities,

Sin 35.4 = h/896.54

h = 896.54 (Sin35.4)

h = 519.35 feet.

Thus, it is right to state that the vertical rise of the included plane is 519.35 ft.

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Full Question:

The Johnstown Inclined Plane in Pennsylvania is one of the longest and steepest hoists in the world. The railway cars travel a distance of 896.5 feet at an angle of approximately 35.4 degrees, rising to a height of 1693.5 feet above sea level. Find the vertical rise of the inclined plane.

(Round your answers to two decimal places.)

Answer:

C.

Step-by-step explanation:

Given that the formula for height is constant divided by width, we can simply rearrange the formula to find the value of constant.

Thus, the formula would be constant = height x width. We will just multiply the x and y coordinates to get the constant.

Hope it helps!

The data form the stem - and - leaf plot is -

1423, 15122, 16, 172, 180778

A Stem and Leaf Plot is a special table where each data value is split into a "stem" (the first digit or digits) and a "leaf" (usually the last digit).

Given is a stem and leaf plot as -

14 I 23

15 I 122

16 I

17 I 2

18 I 0778

The given plot is -

14 I 23

15 I 122

16 I

17 I 2

18 I 0778

So, we can write the data as-

1423, 15122, 16, 172, 180778

Therefore, the data form the stem - and - leaf plot is -

1423, 15122, 16, 172, 180778

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The intercept and slope of the linear function are - 3 and  3 / 2. (Correct choice: C)

Herein we find the representation of a linear function, whose algebraic equation is shown below:

y = m · x + b

Where:

Please notice that intercept is found when x = 0 and slope can be determined by secant line formula:

m = Δy / Δx

Where:

First, determine the intercept of the linear function:

b = - 3

Second, calculate the slope of the line by secant line formula:

m = [3 - (- 6)] / [4 - (- 2)]

m = 9 / 6

m = 3 / 2

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The above syntax of array initialization will assign default values to all array elements according to the data type specified.

double[] connectFour =[6][7]  

An array of arrays is one way to define a 2D array. Matrix structures, which can be thought of as a collection of rows and columns, are used to arrange the 2D array.

However, 2D arrays are developed to provide a data structure that resembles a relational database. It makes it simple to keep large amounts of data at once, which may then be handed to as many functions as needed.

The total elements in any 2D array will be equal to 6 * 7.

The above syntax of array initialization will assign default values to all array elements according to the data type specified.

double[] connectFour =[6][7]

The complete question is:-

We want to create a 2D double array with 6 rows and 7 columns and assign it to connect Four. Which of the following is correct?

(a) double[] connectFour =[6][7]  

(b) double[] connectFour =[6][6]

(c) double[] connectFour =[7][6]

(d) none of these.

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The two rational numbers between the square root of 2 and the square root of 5 are (sqrt(2) + sqrt(5))/2 and (sqrt(5) - sqrt(2))/2.

Give an illustration of what a rational number is.

The number is said to be in the form of p/q and to be rational if p and q are integers and q is not equal to 0. Examples of rational numbers are 1/3, 2/4, 1/5, 9/3, etc.

Step 1: Add sqrt(2) and sqrt(5) to get sqrt(2) + sqrt(5)

Step 2: Divide the result of step 1 by 2 to get (sqrt(2) + sqrt(5))/2

Step 3: Subtract sqrt(2) from sqrt(5) to get sqrt(5) - sqrt(2)

Step 4: Divide the result of step 3 by 2 to get (sqrt(5) - sqrt(2))/2

So the two rational numbers between the square root of 2 and the square root of 5 are (sqrt(2) + sqrt(5))/2 and (sqrt(5) - sqrt(2))/2

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Based on the sample response given, the statements included in the explanation on the horizontal line test are:

a reference to the horizontal-line test.

a statement that the function is one-to-one.

inverse is a function.

What is the horizontal-line test?

The horizontal line test is used to not only find out if a graph has an inverse function, but also if that inverse is also a function itself.

To pass the horizontal line test, the function has to be one-to-one which means that a horizontal line can intersect the graphed function at one point in all places. If this happens, then there is an inverse and the inverse itself is a function.

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Answer: The equations that represent circles that have a diameter of 12 units and a center that lies on the y-axis are:

(x – 6)² + y² = 36

x2 + (y + 6)² = 36

Because a diameter is the distance between two points on a circle that is farthest from each other, the radius of the process must be half of the diameter. So the radius of the ring is 6 units.

The center of the circle must be on the y-axis, it means that the x coordinate of the center is 0, so the equation of the circle will be (x - h)² + (y - k)² = r² where h = 0, k = center on the y-axis, and r = 6.

The first equation, x2 + (y – 3)2 = 36, doesn't represent a circle with a center on the y-axis, because the center of the circle is represented by (0, 3) which is not on the y-axis.

The second equation x2 + (y – 5)2 = 6 doesn't represent a circle with a diameter of 12 units, because the value of the equation is 6 which is not equal to the square of the radius.

The third equation, (x – 4)² + y² = 36, doesn't represent a circle with a center on the y-axis, because the center of the circle is represented by (4, 0) which is not on the y-axis.

The forth equation, (x + 6)² + y² = 144, doesn't represent a circle with a diameter of 12 units, because the value of the equation is 144 which is not equal to the square of the radius.

The fifth equation, x2 + (y + 8)² = 36, doesn't represent a circle with a diameter of 12 units, because the value of the equation is 36 which is not equal to the square of the radius.

Step-by-step explanation:

Answer:

120in

Step-by-step explanation:

120in is 304.8cm, so it is the closest. hope this helps :)

Answer: 120 inches is closest to 300 cm.

Step-by-step explanation:

120 inches = 304.8 cm
300 inches = 762 cm
30 feet = 914.4

I hope this was able to help you :D

An equation of the line of best fit is y = 0.97x + 1.67.

The plant is expected to be 14.28 units tall after 13 months.

In order to determine a linear equation for the line of best fit (trend line) that models the data points contained in the table, we would have to use a scatter plot.

In this scenario, the number of months would be plotted on the x-coordinate of the scatter plot while the height would be plotted on the y-coordinate of the scatter plot.

On the Excel worksheet, you should right click on any data point on the scatter plot, select format trend line, and then tick the box to display an equation for the line of best fit (trend line) on the scatter plot.

From the scatter plot (see attachment) which models the relationship between the number of months and the height, a linear equation for the line of best fit is given by:

y = 0.97x + 1.67

Next, we would determine the predicted height of the plant after 13 months:

y = 0.97(13) + 1.67

y = 14.28 units.

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The final velocity of the car is of:

25 m/s.

The velocity function is a linear function, modeled as follows:

v(t) = v(0) + at.

In which:

The parameter values for this problem are given as follows:

Hence the velocity function is given as follows:

v(t) = 5 + 2t.

At a time of 10 seconds, the velocity is given as follows:

v(10) = 5 + 2(10)

v(10) = 25 m/s.

The car has an initial velocity of 5 m/s, and an acceleration of 2 m/s² during 10 seconds.

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Comparing column a with column b we get that column b is greater than column a. Hence, option B is the correct answer to this question.

Column a: We can find the surface area of a cone by using the formula -

Surface area = π * r * (r + l)

where r is the radius of the base and l is the slant height of the cone.

Substituting r = 3 cm and l = 8 cm, we get,  

Surface area = π * 3 * (3 + 8) = π * 3 * 11 = 33π

Hence, Surface area = 33π  [tex]cm^2[/tex]

Column b: We can find the surface area of a cone by using the formula -

Surface area = π * r * (r + l)

where r is the radius of the base and l is the slant height of the cone.

Substituting r = 4 cm and l = 6 cm, we get,

Surface area = π * 4 * (4 + 6) = π * 4 * 10 = 40π

Hence, Surface area = 40π  [tex]cm^2[/tex]

Comparing we get that,

The surface area of the cone with a base radius of 3 cm and slant height of 8 cm < the surface area of the cone with a base radius of 4 cm and a slant height of 6 cm.

Hence, column a < column b.

Thus, the correct option is B. The quantity in column B is greater.

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The complete question is -

Compare the quantity in column a with the quantity in column b. choose the best answer.

column a: The surface area of the cone with a base radius of 3 cm and a slant height of 8 cm.

column b: The surface area of the cone with a base radius of 4 cm and a slant height of 6 cm.

A. The quantity in column A is greater.

B. The quantity in column B is greater.

C. The two quantities are equal.

D. The relationship cannot be determined from the information given.

Answer:

x = 25°

y = 55°

Step-by-step explanation:

   In Parallelogram, opposite angles are equal.

   3x - 15 = 60

Add 15 to both sides,

           3x = 60 + 15

            3x = 75

Divide both sides by 3,

             x = 75÷3

              [tex]\sf \boxed{x = 25^\circ}[/tex]

AB // CD and BD is transversal, So, alternate interior angles are equal.

        y = 55°

This average will be an example of statistics.

Let’s look at our question:

An example of a statistic is the average weight of those surveyed, which was 157 lbs., from a survey of 40 randomly chosen members of a health and fitness club. It is a computed number that describes some characteristics of a sample collection of data.

What is Statistic?

A statistic is a piece of numerical data that uses quantified models, representations, and synopses for a particular set of data in a study. Statistics are used to determine a parameter's actual value within a population.

Therefore our question will be an example of statistics.

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Answer:

(36 Days)

Step-by-step explanation:

15% of 240 days

= 0.15 x 240

= 36 days

Therefore, The business estimate will be used for vacation or illness for 36 days. Start Learning & Start Growing! edge2023!!!

*DROPS THE MIC*

The histogram of the particle count data is fairly symmetric and bimodal.

This means that the data is distributed evenly around the mean and that there are two separate peaks or modes in the data. This can be quantified by calculating the skewness and kurtosis of the data.

The skewness is a measure of the symmetry of the distribution and can be computed by taking the third moment of the data and dividing it by the standard deviation cubed. In this case, the skewness can be calculated as:

Skewness = (3rd Moment of Data) / (Standard Deviation)^3

The kurtosis is a measure of how peaked the distribution is and can be computed by taking the fourth moment of the data and dividing it by the standard deviation to the fourth power. In this case, the kurtosis can be calculated as:

Kurtosis = (4th Moment of Data) / (Standard Deviation)^4

Using the data, we can calculate the skewness and kurtosis and find that skewness is 0 and kurtosis is -0.064. This indicates that the histogram of the particle count data is fairly symmetric and bimodal.

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Answer:

3/4

Step-by-step explanation:

Answer:

3/4

Step-by-step explanation:

17/12 ×2 × 9/34

153/408 × 2

3/8 ×2

3/4

Answer: To determine which expression is equivalent to 3√/8x²y³ z^4, we need to simplify the given expression and compare it with the options.

First, we can simplify the cube root:

3√/8x²y³ z^4 = (3/8)x^(2/3)y^(1/3)z^(4/3)

Now, we can compare this expression with the options:

A. 2x^(3/2)YZ^(3/4) is not equivalent to the simplified expression because the exponent of x is different (3/2 vs 2/3)

B. 2x^(2/3)YZ^(3/4) is equivalent to the simplified expression. The exponents of x, y and z are the same and the coefficient is also the same

C. 2z/x is not equivalent to the simplified expression because it has different variables and exponents

D. 2x/z is not equivalent to the simplified expression because it has different variables and exponents

Therefore, the expression that is equivalent to 3√/8x²y³ z^4 is B. 2x^(2/3)YZ^(3/4)

Step-by-step explanation: