calculate the expected value of the sample mean of mpg derived from a random sample of four passengers

Answer:

B) −7xy+2y

E) 3x−2+6x^2

The correct answer is f(5) - f(2).

The probability of having more than 2 but less than 5 accidents can be calculated by subtracting the cumulative probability of having 2 or fewer accidents (represented by f(2)) from the cumulative probability of having 5 or fewer accidents (represented by f(5)).

We can calculate the probability of having exactly 3 accidents (represented by f(3)), the probability of having exactly 4 accidents (represented by f(4)), and then sum them up. Another valid answer is f(3) + f(4) - f(2).

Both approaches should yield the same result since they represent the same probability of having more than 2 but less than 5 accidents. It's important to note that the probability mass function (f(x)) represents the probability of a specific value of x occurring.

While the cumulative distribution function (F(x)) represents the probability of x being less than or equal to a specific value.

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Answer:

Using the volume formula we know that (B) 27 cubes can be fitted into the right rectangular prism.

What is the right rectangular prism?

The right rectangular prism has four rectangle-shaped side faces and two parallel end faces that are perpendicular to each of the bases.

Parallelograms make up the sides of an oblique prism, a non-right rectangular prism.

A cuboid is yet another name for a right rectangle prism.

So, the volume of the right rectangular prism:

V = wlh

Insert values:

V = wlh

V = 6*8*4.5

V = 216cm³

Now, the volume of the cube:

V = a³

V = 2³

V = 8cm³

Then, the number of cubes that can be fitted in the right rectangular prism:

216/8 = 27

Therefore, using the volume formula we know that (B) 27 cubes can be fitted into the right rectangular prism.

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Correct question:

How many cubes, with side measures of 2 cm, will fit inside a right rectangular prism with dimensions of 6 cm by 8 cm by 4 1/2 cm?

Group of answer choices

a. 24

b. 27

c. 108

d. 54

The final answer is 27

To determine how many cubes will fit inside the right rectangular prism, we need to find the volume of the prism and the volume of the cubes, then divide the volume of the prism by the volume of the cubes.

Volume of a cube (V_cube) = side^3
V_cube = 2 cm * 2 cm * 2 cm = 8 cubic cm

Volume of the right rectangular prism (V_prism) = length * width * height
V_prism = 6 cm * 8 cm * 4.5 cm = 216 cubic cm

Now, divide the volume of the prism by the volume of the cubes:
Number of cubes = V_prism / V_cube = 216 cubic cm / 8 cubic cm = 27 cubes

Therefore, 27 cubes with side measures of 2 cm will fit inside the right rectangular prism.

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The requried initial value and value after 10 years of car are $24500 and $4285

The given exponential function is:

[tex]V(t) = 24500(0.84^t)[/tex]

To find the initial value of the car, we need to evaluate V(0):

V(0) = 24500(0.84⁰)
       = 24500(1)
       = 24500

Therefore, the initial value of the car is $24,500.

To find the value after 10 years, we need to evaluate V(10):

V(10) = 24500(0.84¹⁰)
        ≈ $4285

Therefore, the value of the car after 10 years is approximately $4285.

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The chances that Nikolas will be falsely accused in a polygraph test are dependent on the accuracy of the test and the criteria used to determine guilt or innocence.

Polygraph tests, also known as lie detector tests, are controversial and have varying degrees of accuracy. The accuracy of a polygraph test depends on many factors, including the expertise of the administrator, the type of test administered, and the physiological response of the individual being tested.

Furthermore, the criteria used to determine guilt or innocence based on the results of a polygraph test can vary. In some cases, a single inconclusive result may be enough to exonerate an individual, while in other cases, a single positive result may be enough to accuse an individual.

It is not possible to provide a specific numerical probability for the chances of Nikolas being falsely accused in a polygraph test.

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The answer to the questions are as follows - a) Yes this situation represents a Markov chain. b)The matrix and diagram are shown below. c)There are two classes.d) the probabilities of the Markov chain being in the states "Green", "Yellow", and "Red" after three more lights are approximately 0.37, 0.33, and 0.3, respectively. e)The proportion of green lights is approximately 0.43, the proportion of yellow lights is approximately 0.19, and the proportion of red lights is approximately 0.29.

(a) Yes, this situation represents a Markov chain since it has the property of memorylessness, meaning that the probability of moving to a certain state in the future depends only on the current state and not on the past.

(b) The transition probability matrix for the Markov chain can be set up as follows:

P =

| 0.4 0.3 0.3 |

| 0.5 0.2 0.3 |

| 0.2 0.5 0.3 |

where the rows and columns correspond to the states "Green", "Yellow", and "Red", respectively, the diagram of the Markov chain is shown below:

       (0.4)        (0.3)        (0.3)

  Green -----> Yellow -----> Red

  <----- (0.5)   <----- (0.2)   <----- (0.3)

       (0.1)        (0.3)        (0.4)

(c) There are two classes in the Markov chain: {Green, Yellow} and {Red}. The first class is recurrent, while the second class is transient.

(d) The probability vector after three more lights can be computed by multiplying the initial probability vector [1 0 0] (since the first light is green) by the transition probability matrix three times. That is, we need to compute:

[1 0 0] * P * P * P

= [0.37 0.33 0.3]

Therefore, the probabilities of the Markov chain being in the states "Green", "Yellow", and "Red" after three more lights are approximately 0.37, 0.33, and 0.3, respectively.

(e) Let g, y, and r denote the proportions of green, yellow, and red lights. Then we have the following system of equations based on the transition probability matrix:

0.4g + 0.5y + 0.2r = g

0.3g + 0.2y + 0.5r = y

0.3g + 0.3y + 0.3r = r

Simplifying each equation, we get;

0.3g - 0.5y + 0.2r = 0

0.3g + 0.3y - 0.5r = 0

-0.3g + 0.2y + 0.3r = 0

Solving this system of equations using Gaussian elimination, we get:

g = (3/7)

y = (4/21)

r = (9/35)

Therefore, the proportion of green lights is approximately 0.43, the proportion of yellow lights is approximately 0.19, and the proportion of red lights is approximately 0.29.

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The complete question is given below-

There are three possible states for a traffic light: Green (G), Yellow (Y), and Red (R) and they simultaneously give the signal. a)Does this situation represent a Markov chain? explain. (b) set up the transition probability matrix and diagram. (c) determine the number of classes and classify them. (d) the first light is green. compute and interpret all probabilities after three more lights. (e) if kymere has many street lights between the home and the university, what proportion of these lights are green, yellow, and red? [no technology estimations permitted. solve this problem with a system of equations showing every step and fraction answers only.]

the initial concentration of the solution in the tank is 0.04 kg/L.

Tank contains 80 kg of salt and 2000 L of water. A solution of a concentration 0.02 kg of salt per liter enters a tank at the rate 6 L/min. The solution is mixed and drains from the tank at the same rate.

What is the concentration of our solution in the tank initially?

Initially, the tank contains 80 kg of salt and 2000 L of water. To determine the initial concentration of the solution in the tank, we need to use the following formula:

concentration = mass of solute / volume of solution

In this case, the mass of solute (salt) is 80 kg and the volume of solution is 2000 L. Therefore, the initial concentration of the solution in the tank is:concentration = 80 kg / 2000 L = 0.04 kg/L

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Log b b an is defined as [logc c a] / [logc c b] in the base-change formula. A base of a logarithmic may utilize any (same) constant value as it's basis, therefore to change the base, we just divide [log a] by [log b].

Activity logs keep track of the time you and your staff spend on particular tasks. It is a thorough record of a tasks, the date, and the amount of time it took to perform each activity.

Log: The opposite of exponentiation in mathematics is the logarithm function. The logarithm is described as a power in which an integer must be increased in order to obtain another number, or, put another way, as a power.

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In your test plan, include the number of repetitions you will perform and a method for analyzing the data to account for random errors.

A test plan should account for the presence of systematic and random errors through the following steps:

1. Calibration: Calibration ensures that the instruments used in the experiment are accurate and consistent. By calibrating the equipment, you can minimize the impact of systematic errors on your results. Start your test plan by ensuring all instruments are calibrated and their measurements are reliable.

2. Randomization: Randomization is the process of randomly assigning subjects or samples to different experimental conditions. This helps to eliminate any potential bias or systematic errors caused by the arrangement of the experiment. In your test plan, make sure to include a method for randomizing the experiment to minimize the effect of systematic errors.

3. Repetition: Repeating the experiment multiple times can help reduce the impact of random errors. By performing the experiment multiple times and averaging the results, you can minimize the influence of random errors on your findings.

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Answer:

the value of (7x)° is one because any thing power 0 is one

I hope the solution helps you.

Part A: The formula for the future value of an investment with compound interest is given by:

A = P(1 + r/n)^(nt)

Where: A = the future value of the investment P = the principal investment amount r = the annual interest rate (as a decimal) n = the number of times the interest is compounded per year t = time in years

For this situation, P = $300 r = 2.45% = 0.0245 (since the interest rate is given as an annual rate, we need to divide it by 100 to convert it to a decimal) n = 4 (since interest is compounded quarterly) t = time in years

Therefore, the equation to model this situation is:

A = 300(1 + 0.0245/4)^(4t)

Part B: To find the value of the account after 15 years, we can simply substitute t=15 into the equation:

A = 300(1 + 0.0245/4)^(4*15) = $476.78

Therefore, the amount of money in the account after 15 years is $476.78.

To calculate the actual percentage of interest that is charged when interest is compounded daily, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where: A = the amount of money owed after one year P = the initial amount owed r = the annual interest rate (as a decimal) n = the number of times the interest is compounded per year t = time in years

In this case, Felipe didn't pay his monthly statements, so we can assume that the balance owed increased each day. Therefore, we should use n = 365 (the number of days in a year) in the formula. Also, since r = 24%, we should use r = 0.24 in the formula. Finally, t = 1, since we are looking for the amount owed after one year.

Using the formula, we get:

A = P(1 + r/n)^(nt) = P(1 + 0.24/365)^(365*1) = P(1.0028)^365 ≈ P(1.34)

Therefore, if Felipe doesn't pay his statements for a full year, the actual percentage he gets charged is approximately 34% (or 0.34 as a decimal).

Answer:

if Felipe never pays his statements for a full year, he would end up paying an actual percentage rate of approximately 471.7% per year (4.717 times the initial balance).

Step-by-step explanation:

Part A:

Let P be the principal amount (initial deposit) of $300

Let r be the annual interest rate of 2.45% = 0.0245

Since the interest is compounded quarterly, we need to divide the annual interest rate by 4 to get the quarterly rate:

i = r/4 = 0.0245/4 = 0.006125

Let n be the number of quarters in t years. Since there are 4 quarters in a year, we have:

n = 4t

The formula for compound interest is:

A = P(1 + i)^n

Substituting the given values, we get:

A = 300(1 + 0.006125)^(4t)

Part B:

We want to find the balance in Lucy's savings account after 15 years, so we substitute t = 15 into the equation:

A = 300(1 + 0.006125)^(4t)

A = 300(1 + 0.006125)^(4×15)

A = 300(1.006125)^60

A ≈ $464.25

Therefore, Lucy's savings account will have approximately $464.25 after 15 years.

If Felipe never pays his statements for a full year, the interest would compound daily, so we need to use the formula for daily compounded interest, which is:

A = P(1 + r/n)^(nt)

where:

P is the principal (starting balance) on the credit card

r is the annual interest rate (24%)

n is the number of times the interest is compounded per year (365 for daily compounding)

t is the time in years (1 year)

Substituting the values, we get:

A = P(1 + r/n)^(nt)

A = P(1 + 0.24/365)^(365×1)

A = P(1.0006575)^365

A ≈ 4.717P

Therefore, if Felipe never pays his statements for a full year, he would end up paying an actual percentage rate of approximately 471.7% per year (4.717 times the initial balance).

The value of x is 4.4, option D is correct.

A geometric figure called an angle is made up of two rays that end at the same point, called the vertex. Radians or degrees are used to measure angles.

Given the value are;  

∠XOZ = 78°, ∠YOZ = 40° and ∠XOY = (5x + 16)°,

See the figure, according to that

∠XOZ = ∠YOZ + ∠XOY

put the values,

78 = 40 + (5x + 16)

78 - 40 - 16 = 5x

22 = 5x

22 / 5 = x

4.4 = x

Therefore, the value of x is 4.4 option D is correct.

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Thus, the solution of the given inequality is found as: n > 4.86. The graph is plotted.

When two parameters are equal, we use the sign "=," and when they aren't equal, we use the symbol "," meaning refers for "not equal." The first value may be greater than (>), less than (<), greater than equal to (≥), or less than equal to (≤) the second value if the two values are not equal.

Given inequality:

1.9(2.3n + 6) + 10.45 > 43.7

Subtract each side by 10.45

1.9(2.3n + 6) + 10.45 - 10.45 > 43.7 - 10.45

1.9(2.3n + 6) > 33.25

Divide each side by 1.9

1.9(2.3n + 6) / 1.9 > 33.25/1.9

2.3n + 6 > 17.5

Subtract both sides by 6

2.3n + 6 - 6 > 17.5 - 6

2.3n > 11.5

Now, divide each side by 2.3

2.3n/2.3 > 11.5/2.3

n > 4.86

Thus, the solution of the given inequality is found as: n > 4.86.

As, n must be great then 4.86, value of 4.86 is not take for n.

The graph is plotted.

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Correct question:

1. Solve 1.9(2.3n + 6) + 10.45 > 43.7 . Then graph the solution.

Answer:

the price that generates maximum profit is $152.94, rounded to the nearest cent.

Step-by-step explanation:

Let's begin by finding the profit generated by the promotion at each price point.

At $17.99/person:

Profit = Revenue - Cost

Profit = $17.99 x 112 - (10 + 5 + 3) x 112

Profit = $2016.64

At $19.99/person:

Profit = Revenue - Cost

Profit = $19.99 x 96 - (10 + 5 + 3) x 96

Profit = $1497.12

To find the price that generates maximum profit, we need to use the formula:

Price = (Fixed Cost + Variable Cost) / Number of Customers + Profit per Customer

We can assume that the fixed cost for the restaurant is $10,000 per day, and the variable cost per person is $5 for ingredients and $3 for labor.

For $17.99/person:

Price = ($10,000 + (5 + 3) x 112) / 112 + ($2016.64 - $17.99)

Price = $152.94

For $19.99/person:

Price = ($10,000 + (5 + 3) x 96) / 96 + ($1497.12 - $19.99)

Price = $156.24

Therefore, the price that generates maximum profit is $152.94, rounded to the nearest cent.

The equation of equation according to the given unknown is [tex]y=-3x-\frac{2}{5}[/tex]

The edges that connect the graph's vertices (also known as nodes) are its vertices (lines). The use of the linear graph extends beyond mathematics into a variety of disciplines, including computer science, linguistics, biology, physics, and chemistry. The best example of a graph structure in real life is GPS, which allows you to follow a route or determine a road's direction.

The y-intercept is the point at which the graph crosses the y-axis. The most important step in graphing any function with the formula y = f(x) is finding the intercepts. For a function, an intercept can take one of two forms. What they are is what the x-intercept and y-intercept are. A function's "intercept" is the location where the axis is cut by the function's graph.

we have the equation y=mx+b

m is the slope and b is the y-intercept

[tex]y=-3x-\frac{2}{5}[/tex]

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The value of n cannot be included in any of the intervals generated by the bootstrap method. The number of intervals including n depends on the distribution of the estimates and the true value of n.

As the value of n is fixed and is not a result of any estimation or sampling process, it cannot be included in any of the intervals generated by the bootstrap method. Therefore, none of the intervals covering the middle 95% of the bootstrap estimates would include n.

However, as the bootstrap method is a resampling technique, the estimates generated by it can vary from sample to sample. Therefore, the number of intervals covering the middle 95% of the bootstrap estimates that include n would depend on the distribution of the estimates and the true value of n.

In general, if the estimates are centered around the true value of n, we would expect a higher number of intervals to include n. Conversely, if the estimates are more dispersed, we would expect a lower number of intervals to include n. Without further information about the estimates, it is difficult to provide a more specific answer.

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The complete question is :

Suppose you have performed a new bootstrap estimate on a dataset with n=50 and generated 100 intervals covering the middle 95% of the estimates. Does any of these intervals include n? Also, how many of these intervals would you expect to include n?

We use factoring to solve the first Equation, x² + 4x = 15, and use the zero product property to solve the second equation, 2x(x−3)=0.

For the first equation, x² + 4x = 15, we can use the quadratic formula or completing the square technique to solve it. However, since the equation is already in standard form, we can use factoring to solve it. By rearranging the equation, we get x² + 4x - 15 = 0. This can be factored as (x + 5)(x - 3) = 0. Therefore, the solutions are x = -5 and x = 3.

For the second equation, 2x(x−3)=0, we can use the zero product property to solve it. This property states that if the product of two factors is equal to zero, then at least one of the factors must be equal to zero. Therefore, we have 2x = 0 or x - 3 = 0. Solving for x, we get x = 0 or x = 3. These are the solutions to the equation.

In summary, we use factoring to solve the first equation, x² + 4x = 15, and use the zero product property to solve the second equation, 2x(x−3)=0.

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The total work done by the worker is approximately 4346.32 J, and the power developed by the worker is approximately 24.14 W.

To calculate the total work done by the worker, we need to consider both the horizontal pushing work and the vertical lifting work.

Horizontal pushing work:

Work (W) = Force (F) × Distance (d) × cos(θ)

where θ is the angle between the force and the displacement.

Since the force is applied horizontally and the displacement is also horizontal, the angle between them is 0 degrees, and cos(0) = 1.

Vertical lifting work:

To calculate the work done in lifting the load vertically, we first need to find the force required to lift the load. The force required to lift the load is equal to the weight of the load:

Weight (Wt) = Mass (m) × Acceleration due to gravity (g)

where g ≈ 9.81 m/s² (approximately, on Earth's surface).

Wt = 60 kg × 9.81 m/s²

Wt ≈ 588.6 N

Now, we can calculate the work done in lifting the load:

W_vertical = Wt × h × cos(0)

where h is the vertical height.

W_vertical = 588.6 N × 1.2 m × 1

W_vertical ≈ 706.32 J

Now, we can find the total work done:

Next, we'll calculate the power developed by the worker. Power is the rate of doing work, and it can be calculated as:

Power (P) = Work (W) / Time (t)

The worker does the work in 3 minutes, so we need to convert this time to seconds:

t = 3 min × 60 s/min = 180 s

Now, we can calculate the power:

P = W_total / t

P ≈ 4346.32 J / 180 s

P ≈ 24.14 W (watts)

So, the total work done by the worker is approximately 4346.32 J, and the power developed by the worker is approximately 24.14 W.

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The question in English is:

A construction worker pushes a 60-kg load across the floor a distance of 14 m by applying a force of 260 N, then lifts the load vertically to a platform that is 1.2 m above the floor. I do this work in a total of 3 minutes. What is the total work and power developed by the worker?

If Sara sat down to eat at 6:45 pm, the two numbers to show the time range would be 6 and 7 because 6:45 pm is between 6:00 pm and 7:00 pm.

To determine the two numbers that should be between to show the time Sara sat down to eat, follow these steps:
1. Identify the given time:

Look for the time mentioned in the question or context.

Since the time is not provided, we cannot provide specific numbers.
2. Determine the range:

Find the nearest hour before and after the given time.

These two hours will be the numbers to show the time range.

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Answer:

6.75 x 10^2 g

Step-by-step explanation:

Mass of Red Blood Cells

The mass of a red blood cell is about 2.7 X 10−112.7 X 10 −11 grams. There are about 2.5 X 10132.5 X 10 13 red blood cell in a human body. What is the total mass, in grams, of the red blood cells in a human body? Express your answer in standard form

To find the total mass of red blood cells in a human body, we need to multiply the mass of one red blood cell by the total number of red blood cells in the body:

Total mass = (mass of one red blood cell) x (total number of red blood cells)

Total mass = (2.7 x 10^-11 grams) x (2.5 x 10^13 red blood cells)

Multiplying these two numbers gives:

Total mass = 6.75 x 10^2 grams

In standard form, this is:

Total mass = 6.75 x 10^2 g

The dοmain οf the relatiοn is the set οf all x-values that appear in the graph, which is {-5, -2, -1, 0, 1, 5}.

In mathematics, the dοmain οf a functiοn is the set οf all pοssible input values fοr which the functiοn is defined.

The dοmain οf the relatiοn is {-5, -2, -1, 0, 1, 5}.

This is because the x-values οf the given pοints are -5, -2, -1, 0, 1, and 5, and there are nο οther x-values indicated in the graph.

Hence, the dοmain οf the relatiοn is the set οf all x-values that appear in the graph, which is {-5, -2, -1, 0, 1, 5}.

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The equations of the directrices are x = -3.6 and x = 3.6.

To find the equations of the directrices for a hyperbola, we need to first identify its major components.

Since the hyperbola is centered at the origin, its center is (0, 0). We are given a vertex at (-6, 0) and a focus at (10, 0).
1. Determine the value of a and c:
Since the vertex is at (-6, 0), the distance from the center to the vertex is |a| = 6.
Since the focus is at (10, 0), the distance from the center to the focus is c = 10.
2. Calculate the value of b using the relationship[tex]c^2 = a^2 + b^2:[/tex]
[tex]c^2 - a^2 = b^2[/tex]
[tex]10^2 - 6^2 = b^2[/tex]

[tex]10^2 - 6^2 = b^2[/tex]
[tex]100 - 36 = b^2[/tex]
[tex]64 = b^2[/tex]
b = 8
3. Find the distance from the center to the directrices (d) using the relationship [tex]d = a^2 / c[/tex]:
[tex]d = a^2 / c[/tex]
[tex]d = 6^2 / 10[/tex]
d = 36 / 10
d = 3.6
4. Determine the equations of the directrices:
Since the hyperbola is horizontal, the directrices will be vertical lines.

The directrices are located at a distance of d from the center, so their equations are x = ±d.

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The true statement regarding Pearson's correlation coefficient is that it can be used as an effect size measure.What is Pearson's correlation coefficient?Pearson's correlation coefficient is a statistic that measures the strength and direction of the linear relationship between two quantitative variables.

It is a measure of the linear correlation between two variables, which ranges from -1 to 1. Pearson's correlation coefficient can be used to examine the degree of relationship between two continuous variables.

When it comes to Pearson's correlation coefficient, the following statements are correct:It can be used as an effect size measure.It can be used on ranked data.It cannot be used with a binary variable (those taking on a value of 0 or 1).It varies between -1 and +1.

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Answer:

[tex]\large\boxed{\tt 18a+42}[/tex]

Step-by-step explanation:

[tex]\textsf{We are asked to simplify the given expression.}[/tex]

[tex]\textsf{Per similar problems, we should use the \underline{Distributive Property}.}[/tex]

[tex]\large\underline{\textsf{What is the Distributive Property?}}[/tex]

[tex]\boxed{\begin{minipage}{25 em} \\ \underline{\textsf{\large Distributive Property;}} \\ \\ \textsf{Distributive Property is a property that allows us to multiply the term to the left of the parentheses into the terms inside the parentheses.} \\ \\ \underline{\textsf{\large Example;}} \\ \tt a(b+c)=ab+ac \\ \textsf{Per this example, a will multiply with the terms b and c.}\end{minipage}}[/tex]

[tex]\large\underline{\textsf{Simplifying the Expression;}}[/tex]

[tex]\textsf{For our given expression, let's use the Distributive Property.}[/tex]

[tex]\underline{\textsf{Use the Distributive Property;}}[/tex]

[tex]\tt 6 (3a + 7) \rightarrow (6 \times 3a) + (6 \times 7) \rightarrow \large\boxed{\tt 18a+42}[/tex]

Hello and greetings AtticusR9000.

To solve this exercise, we apply the distributive property, which is a mathematical rule that establishes that the multiplication of a number by the addition or subtraction of two or more numbers is equal to the addition or subtraction of the multiplication of that number by each of the numbers. that are being added or subtracted. In other words, if we have three numbers a, b and c, then the distributive property can be written as:

a × (b + c) = (a × b) + (a × c)

or also as:

a × (b - c) = (a × b) - (a × c)

This means that the multiplication of the number "a" can be distributed through the addition or subtraction of the numbers "b" and "c" to obtain the same result as if "a" were multiplied by "b" and "a" by "c" and then add or subtract the results. The distributive property is fundamental in mathematics and is used in numerous algebraic and arithmetic operations.

Now we solve by applying the distributive property:

a × (b + c) = (a × b) + (a × c)

6(3a + 7) = (6 × 3a) + (6 × 7)

18a + 42

Therefore, the solution of exercise 6(3a+7) is 18a+42.

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To solve these problems, we can use the distance formula and the concept of symmetry.

A. The distance from point A to the 0yz plane is simply the absolute value of the x-coordinate of point A. Therefore, the distance is:

|2| = 2

So the distance from point A to the 0yz plane is 2 units.

B. The distance from point A to the 0x axis is simply the distance between point A and its projection onto the 0x axis, which is the point (2, 0, 0). Therefore, the distance is:

√[(2-2)^2 + (-4-0)^2 + (-3-0)^2] = √(16 + 9) = √25 = 5

So the distance from point A to the 0x axis is 5 units.

C. To find the coordinates of point A which is symmetric with respect to the 0yz plane, we simply need to negate the x-coordinate of point A. Therefore, the symmetric point is (-2, -4, -3).

D. To find the coordinates of point A which is symmetric about the 0z axis, we simply need to negate the y and x coordinates of point A. Therefore, the symmetric point is (-2, 4, -3).

The modal class of time spent exercising from the table that shows the time spent exercising, is 40 < x ≤ 50.

The class that the median lies is 30 < x ≤ 40.

The modal class would be the one that has the highest frequency which is the class that has the most time spent exercising. That class is the 40 < x ≤ 50 class with 21 people.

The class in which the median lies is the middle class and we need to find the total first:

= 18 + 14 + 3 + 16 + 21 + 7

= 79 people

The median frequency is therefore:

= ( 79 + 1 ) / 2

= 40 th position

This is located in the 30 < x ≤ 40 class.

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