What is the product of (3a 2)(4a2 – 2a + 9)?a. 12a3 − 2a + 18b. 12a3 + 6a + 9c. 12a3 − 6a2 + 23a + 18d. 12a3 + 2a2 + 23a + 18

Answer:

Step-by-step explanation:

x^2-2xz+xy-2yx^2+xy-xz-yz =x^2+xy+xy-yz-2xz-xz-2yx^2

=x^2+xy+xy-yz-2xz-xz-2yx^2

=x^2+2xy-yz-3xz-2x^2y

The probability that a randomly selected part is not defective is 47/50.

Probability is a way of calculating how likely something is to happen. It is difficult to provide a complete prediction for many events. Using it, we can only forecast the probability, or likelihood, of an event occurring. The probability might be between 0 and 1, where 0 denotes an impossibility and 1 denotes a certainty.

Here Total number of parts machine makes = 50

Number of parts defective out of 50 = 3

Then number of parts not defective out of 50 = 50-3 = 47.

Now using probability formula:

Probability = No of favorable item/ Total no of item

Now probability that a randomly selected part is not defective is,

= 47/50.

Hence the probability that a randomly selected part is not defective is 47/50.

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Answer:

621.09 mm²

Step-by-step explanation:

Area of pentagon = [tex]\frac{(perimeter) (apothem)}{2}[/tex]

Let's solve

[tex]\frac{(5 times 19) times 13.08}{2}[/tex] = 621.09 mm²

So, the answer is 621.09 mm²

Answer: 8.58 cm²

Step-by-step explanation:

The area of the central triangle bounded by each of the sides can be computed as ...

 A = (1/2)r²sin(α) . . . . where α is the central angle, 360°/5 = 72°  

There are 5 such triangles, so the area of the pentagon is

A = (5/2)(1.9 cm)²sin(72°) ≈ 8.58 cm²

The scaled values sum up to 1/10.

        k subscript 1 + k subscript 2 = 1

        E[10 k subscript 1 theta with hat on top subscript 1 + 10 k subscript 2 theta with hat on top subscript 2] = 10 k  subscript 1 E[theta with hat on top subscript 1] + 10 k subscript 2 E[theta with hat on top subscript 2]

        E[theta with hat on top subscript 1] = theta

        E[theta with hat on top subscript 2] = theta

        E[10 k subscript 1 theta with hat on top subscript 1 + 10 k subscript 2 theta with hat on top subscript 2] = 10 k subscript 1 theta + 10 k subscript 2 theta = theta (10 k subscript 1 + 10 k subscript 2) = theta

        k subscript 1 + k subscript 2 = 1

        10 k subscript 1 + 10 k subscript 2 = 10

       k subscript 1 + k subscript 2 = 1

       k subscript 1/10 + k subscript 2/10 = 1/10

Therefore, their sum is equal to 1, and their scaled values sum up to 1/10.

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This means that half of the schools requested more than 87.5 seedlings and half requested less than 87.5 seedlings.

To find the median number of seedlings requested by the 9 schools for Earth Day, we need to first arrange the number of seedlings requested by each school in ascending or descending order. Let's assume the following number of seedlings were requested by each school:

School 1: 50 seedlings
School 2: 60 seedlings
School 3: 75 seedlings
School 4: 80 seedlings
School 5: 85 seedlings
School 6: 90 seedlings
School 7: 100 seedlings
School 8: 120 seedlings
School 9: 150 seedlings

Now, to find the median, we need to find the middle value. In this case, there are 9 schools, so the middle value will be the average of the 5th and 6th values. The 5th value is 85 and the 6th value is 90, so the median is (85 + 90) / 2 = 87.5 seedlings.

Therefore, the median number of seedlings requested by the 9 schools for Earth Day is 87.5.

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The length 53.1°, 90°, and 39.9°,vertical length: 3/5 ,length of vertical: 4/5 1 hypotenuse.

Angle is a geometric concept that describes the relative difference between two straight lines or planes that meet at a common point. It is measured in degrees, radians or grads, and is often represented by the symbol θ. An angle can be acute, right, obtuse, straight, reflex, or full. Angles can be used to measure the size of a triangle, to calculate the area of a figure, and to determine the position of a point in a coordinate system.

We possess that

Angle = 53.1°

Vertical length = 3/5 (this is the adjacent cathetus)

Vertical length equals 4/5 (this is the opposite cathetus)

We can use it to check this.

tg(angle) = adjacent/opposite:

tg(53.1) = 1.33

and

(4/5)/(3/5) = 4/3 = 1.33

This makes sense, then.

Using the relationship, we can now identify the hypotenuse:

Sin(angle) = the antipode or hypotenuse

sin(53.1) = (4/5)/H

H = (4/5)/sin(53.1) = 1

Hence, there is always a 90° angle in a triangle or rectangle.

We may get the final angle using the fact that the sum of a triangle rectangle's three interior angles is always 180 degrees.

A + 53.1° + 90° = 180°

A = 90° - 53.1° = 36.9°

Now that we have located every missing part of the triangle.

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The total amount of energy used by the computer is:

0.4 kW × 20.7 h = 8.28 kWh

The cost of the energy used is:

8.28 kWh × $0.08/kWh = $0.6624

Therefore, it costs $0.66 to use the computer.

A computer in a house uses 0.4 kilowatt for 20.7 hours. If electricity costs $0.08 per kilowatt-hour, how much does it cost (in dollars, to the penny) to use the computer? use exact numbers; do not estimate.

The cost of using the computer for 20.7 hours can be found by multiplying the electricity used per hour by the cost per kilowatt-hour.

That is,Cost = Power (kilowatts) × Time (hours) × Cost per kilowatt-hour (dollars)Given that the power used by the computer is 0.4 kilowatts and the time it was used is 20.7 hours, we can find the total cost of using the computer by substituting the values in the above equation.Cost = 0.4 kilowatts × 20.7 hours × $0.08 per kilowatt-hourCost = 0.4 × 20.7 × 0.08Cost = $0.06624Therefore, it costs $0.06624 to use the computer.

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To complete her journey Ann needs to run for (120/3) = 40 minutes in order to travel at an average speed of 5 km/h.

We can start by using the formula:

average speed = total distance ÷ total time

Let's first calculate the total distance Ann covers:

distance walked = speed x time = 4 km/h x (8 km / 4 km/h) = 8 km

distance run = speed x time

Let's call the time Ann runs for "t". Then:

distance run = 8 km/h x (t/60) h = (8t/60) km

Total distance = distance walked + distance run = 8 km + (8t/60) km = (480 + 8t) / 60 km

Now, let's find the total time:

total time = time walked + time run

time walked = distance ÷ speed = 8 km ÷ 4 km/h = 2 h

time run = t/60 h

total time = 2 h + t/60 h = (120 + t)/60 h

Now we can substitute the values we have found into the formula for average speed:

5 km/h = [(480 + 8t)/60 km] ÷ [(120 + t)/60 h]

Simplifying the right-hand side, we get:

5 km/h = (480 + 8t) / (120 + t)

Multiplying both sides by (120 + t), we get:

600 + 5t = 480 + 8t

Subtracting 480 and 5t from both sides, we get:

120 = 3t

Therefore, Ann has to run for (120/3) = 40 minutes to have an average speed of 5 km/h over her complete journey.

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Answer:

If u mean 312 inches then the answer is 12480in^3

Step-by-step explanation:

To solve volume do LxWxH which is Length times width time height.

The formula one-half(a° - b°) is derived from the fact that the exterior angle of a triangle is equal to one-half the difference between the measures of the two remote interior angles.

The formula that would be used to find the measure of angle 1 is one-half(a° - b°). This formula applies to a situation where angle 1 is an exterior angle of a triangle, and a° and b° are the measures of the two remote interior angles of the triangle that are adjacent to angle 1. The exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. Mathematically, this can be expressed as:

angle 1 = a° - b°

To find the measure of angle 1 using the formula one-half(a° - b°), we would simply plug in the known values of a° and b°, and perform the necessary arithmetic operations.

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Answer:

D: Left side

Step-by-step explanation:

The coordinates of the image is at

The coordinates of the image is solved by applying the translation rule which is

(x, y) → (x + 6, y - 4)

This is applied as follows

preimage coordinates    translation        image coordinates

(-9, 2)                 →             (-9 + 6, 2 - 4) → (-3, -2)

(-9, 4)                 →             (-9 + 6, 4 - 4) → (-3, 0)

(-7, 4)                 →             (-7 + 6, 4 - 4) → (-1, 0)

(-5, 2)                →             (-5 + 6, 2 - 4) → (1, -2)

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The required number of elements in set A and set B as per given elements of A, B , and A ∪ B is equal to |A ∩ B| = 3.

Number of elements in set A,  |A| = 97

Number of elements in set B, |B|  = 16

Total number of elements in set A or set B,  |A ∪ B| = 110

Use the formula for the size of the union of two sets,

|A ∪ B| = |A| + |B| - |A ∩ B|

where |A| represents the number of elements in set A,

|B| represents the number of elements in set B,

And |A ∩ B| represents the number of elements in the intersection of sets A and B.

Rearrange the formula to solve for |A ∩ B|,

|A ∩ B| = |A| + |B| - |A ∪ B|

⇒|A ∩ B| = 97 + 16 - 110

⇒|A ∩ B| = 3

Therefore, the number of elements in sets A and B have 3 elements in common.

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As a result, the product property can be used to manipulate and equation statements containing 2xy, as well as to express 2xy in terms of its factors.

An equation is a statement that shows the equality between two mathematical expressions. It is a fundamental concept in mathematics and is used to describe relationships between quantities.

The purpose of an equation is to find the value of the unknown variable(s) that make the equation true. This is typically done by applying algebraic operations to manipulate the equation, with the goal of isolating the variable on one side of the equal sign.

[tex]2xy = 2 * x * y[/tex]

[tex]2xy = 2x * y = 2y * x = x * 2y = y * 2x = x * y * 2[/tex]

[tex]4x^2y * 3xy^2 = (4 * x * x * y) * (3 * x * y * y)[/tex]

[tex]= 12 * x^3 * y^3[/tex]

As a result, the product property can be used to manipulate and simplify statements containing 2xy, as well as to express 2xy in terms of its factors.

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Jamal spends a total of $44 on lunch for his family, including tax and tip.

Algebraic expression can be defined as combination of variables and constants.

The total cost of the drinks is 4 x $1.75 = $7.

The total cost of the sandwiches is 4 x $7.50 = $30.

So, the subtotal before the tip is $7 + $30 = $37.

Since the prices include tax, we can directly add the tip to the subtotal to get the total amount Jamal spends:

Total cost = Subtotal + Tip = $37 + $7 = $44.

Therefore, Jamal spends a total of $44 on lunch for his family, including tax and tip.

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Total 84 students, are needed to guarantee that there are two students expected to graduate in the same year who have the same major.

We have undergraduate students at a college. Students belong to 4 groups (depending on year ) and 21 different majors. Total different majors for choice

= 21

We have to determine number of students needed to guarantee that there are two students expected to graduate in the same year who have the same major. Using the combinations, total different combinations possible for student having a particular major and year = 21× 4 = 84

By Pigeon Hole principle, if there is n boxes and m objects then atleast one box must contain more then one object. Here, we have 84 different Buckets . The 85th object ( 84 + 1 = 85) makes sure

bucket has 2 objects. The 85 is required number of students to that atleast one Year and 21 students in same year and same major.

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Decreasing the circumference of a tire by 20% would increase the number of rotations required to travel a given distance.

What is Circumference ?

Circumference is the distance around the outside of a circle or a curved object. It is the measurement of the boundary line or the perimeter of the circular object. The circumference of a circle is calculated using the formula C = 2πr, where "C" is the circumference, "r" is the radius of the circle, and "π" (pi) is a mathematical constant approximately equal to 3.14159.

The number of rotations of a tire depends on its circumference, which is the distance around the outside of the tire. If the circumference of a tire decreased by 20%, it means that the distance around the outside of the tire would be 20% less than it was before. This would cause the tire to cover less ground in each rotation, which would result in an increase in the number of rotations needed to travel a given distance. Specifically, the number of rotations would increase by 20% for the same distance traveled, as the tire would need to rotate more times to cover the same distance due to the reduced circumference.

Therefore, decreasing the circumference of a tire by 20% would increase the number of rotations required to travel a given distance.

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Let's start by using the formula for the total labor cost:

Total labor cost = Fixed cost + (Number of employees x Cost per employee)

We know that the fixed cost is $32,782.00, and the cost per employee is $31,009.00. Let's represent the number of employees with the variable "x". So we have:

$3,133,682.00 = $32,782.00 + (x * $31,009.00)

Simplifying the equation:

$3,133,682.00 - $32,782.00 = x * $31,009.00

$3,100,900.00 = x * $31,009.00

x = $3,100,900.00 / $31,009.00

x ≈ 100

Therefore, the company intends to employ approximately 100 people next year.

The cost of 1800 bricks is $7,386.76. The cost of 1800 bricks, each measuring 7 1/4 in by 21 1/4 in by 3 1/4 in and weighing 0.06 ounces per cubic inch, can be calculated as follows:

First, we need to find the volume of one brick by multiplying its three dimensions:

Volume of one brick = 7.25 in x 21.25 in x 3.25 in = 526.0156 cubic inches

Next, we can find the weight of one brick by multiplying its volume by its weight per cubic inch:

Weight of one brick = 526.0156 cubic inches x 0.06 ounces/cubic inch = 31.56094 ounces

The total weight of 1800 bricks can be found by multiplying the weight of one brick by 1800:

Total weight of 1800 bricks = 31.56094 ounces/brick x 1800 bricks = 56,809.6928 ounces

Finally, we can find the cost of the bricks by multiplying their total weight by the cost per ounce:

Cost of 1800 bricks = 56,809.6928 ounces x $0.13/ounce = $7,386.76

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Answer:

x = y + 3

Step-by-step explanation:

y = x - 3 ( add 3 to both sides )

y + 3 = x , that is

x = y + 3

The answer is option b. confidence coefficient.

To explain this, let's start by defining interval estimation. Interval estimation is a statistical method used to estimate an unknown population parameter (such as the population mean or proportion) by constructing a range of values, called a confidence interval, that contains the true value of the parameter with a certain level of confidence.

The level of confidence refers to the percentage of times that the interval estimation procedure will generate an interval that contains the actual value of the population parameter being estimated. For example, a 95% confidence level means that if we were to repeat the interval estimation procedure many times, we can expect to obtain a confidence interval that contains the true population parameter 95% of the time.

The confidence coefficient, on the other hand, is the probability that a particular confidence interval actually contains the true value of the population parameter. It is the complement of the significance level, which is the probability of making a Type I error (rejecting a true null hypothesis). For example, if we have a 95% confidence level, then the confidence coefficient is 0.95, and the significance level is 0.05.

Therefore, the confidence coefficient represents the probability that the interval estimation procedure will generate an interval that contains the actual value of the population parameter being estimated. It is a measure of how confident we are that the estimated interval contains the true population parameter.

In conclusion, the confidence coefficient is a crucial concept in interval estimation that reflects the probability of obtaining a confidence interval that includes the true population parameter. It provides a measure of the reliability and accuracy of the interval estimation procedure and helps researchers interpret the results of their analyses.

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The director of fitness for a large corporation with over 5,000 employees recorded the resting heart rate, in beats per minute (bpm), for 35 employees who were known to wear activity trackers. The following boxplot summarizes the results.

The director wants to estimate the resting heart rate for all employees with a confidence interval. Have all conditions for inference been met?Solution:Yes, all conditions for inference have been met.The given boxplot represents the resting heart rate, in beats per minute (bpm), for 35 employees who were known to wear activity trackers.

As the sample size is greater than 30, we can use the normal distribution to create a confidence interval. Additionally, there are no outliers in the data, which suggests that the data is normally distributed. Therefore, we can conclude that all conditions for inference have been met.

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According to given information, Joanna bought 6 notebooks and 8 pencils with total cost $20.94, which is answer choice A.

What is cost?

cost refers to the amount of money required to purchase or produce a particular item or service.

Let's assume that Joanna bought x notebooks and y pencils. We know that she bought a total of 14 items, so:

x + y = 14

We also know that the total cost of her purchase was $20.94, so:

2.05x + 1.08y = 20.94

We can use the first equation to solve for x:

x + y = 14

x = 14 - y

Substitute this expression for x in the second equation:

2.05x + 1.08y = 20.94

2.05(14 - y) + 1.08y = 20.94

28.7 - 2.05y + 1.08y = 20.94

-0.97y = -7.76

y = 8

Substitute this value of y back into the equation x + y = 14:

x + 8 = 14

x = 6

So, Joanna bought 6 notebooks and 8 pencils, which is answer choice A.

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According to the figure the value of x is

The value of x is solved using the intersecting secant tangent theorem

The theorem have the formula

12^2 = 9 * (9 + x)

solving for x

144 = 81 + 9x

9x = 63

9x / 9 = 63 / 9

x = 7

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The function that they can use to determine how strongly related are two of the variables is equals to the cor() which stands for correlation. So, the correct choice for answer is option (c).

The function cor() returns the correlation between two variables. In R language, the cor() function is used to determine the correlation coefficient between two

vectors. Correlations may be generated

using the cor() function, while covariance

can be generated using the cov() function. In statistical, correlation shows us how strong the relationship is between two variables. It describes the degree to which two variables are linearly connected (meaning they change together at a constant rate). In case of symmetry, the correlation between A and B is the same as the correlation between B and A. The most used correlation coefficients are Pearson, Spearman, and Kendall.

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Complete question:

A data analyst is using statistical measures to get a better understanding of their data. What function can they use to determine how strongly related are two of the variables?

A) sd()

B) mean

C) cor()

D) bias()

Step-by-step explanation:

The coefficient of C in the inequality 56C+64R<9000 represents the rate of fuel consumption while flying through clear skies. From the inequality, we can see that the rate of fuel consumption while flying through clear skies is 56 gallons per minute.

To find the initial fuel capacity of the airplane, we need to set the values of C and R to zero in the inequality 56C+64R<9000, since this represents the scenario where the plane flies entirely through clear skies and does not encounter any rain clouds.

56(0) + 64(0) < 9000

Simplifying the inequality, we get:

0 < 9000

This means that the inequality is true for any positive value of C and R, including C = 0 and R = 0. Therefore, the airplane has more than 0 gallons of fuel before takeoff, but the exact amount is not specified in the given information.

The given inequality is:

56C + 64R < 9000

We know that the airplane consumes fuel at a constant rate while flying through clear skies. Let the fuel consumption rate be F (in gallons per minute) and let the amount of fuel the airplane has before takeoff be T (in gallons).

We need to find the values of F and T that satisfy the given inequality.

First, we can simplify the inequality by dividing both sides by 8:

7C + 8R < 1125

Next, we can use the fact that the airplane consumes fuel at a rate of 64 gallons per minute while flying through rain clouds to write an expression for the total fuel consumption during R minutes:

64R

Similarly, the total fuel consumption during C minutes while flying through clear skies is:

FC

The total fuel consumption during both C and R minutes can be expressed as:

FC + 64R

We know that the total fuel consumption must be less than the initial amount of fuel, which is T. Therefore, we can write:

FC + 64R < T

Substituting FC = F * C, we get:

F * C + 64R < T

We can rearrange this inequality to solve for T:

T > F * C + 64R

Now we can use the inequality 7C + 8R < 1125 to solve for F and T.

Let's assume the airplane has enough fuel to fly for 1 hour (60 minutes) in clear skies and no rain clouds. Then C = 60 and R = 0. Substituting these values into the inequality, we get:

56(60) + 64(0) < 9000

3360 < 9000

This is true, so our assumption is valid.

Using the assumption that the airplane has enough fuel to fly for 1 hour in clear skies, we can solve for F and T:

T > F * C + 64R

T > F * 60 + 64(0)

T > 60F

Since we assumed the airplane has enough fuel to fly for 1 hour in clear skies, T must be greater than the amount of fuel consumed during that time:

T > F * 60

Combining these two inequalities, we get:

60F < T < 60F + 3360

Now we can choose any value of F between 0 and 64 that satisfies the inequality, and choose a value of T that is greater than 3360 + 60F. For example, we can choose:

F = 30 (assuming a fuel consumption rate of 30 gallons per minute in clear skies)

T = 4000 gallons (initial amount of fuel)

Substituting these values into the inequality, we get:

56C + 64R < 9000

56(60) + 64R < 9000

3360 + 64R < 9000

64R < 5640

R < 88.125

Therefore, the airplane can fly for 88.125 minutes (or approximately 1 hour and 28 minutes) through rain clouds before consuming all of its fuel, if it is flying at a rate of 64 gallons per minute. And if the airplane consumes fuel at a rate of 30 gallons per minute while flying through clear skies, it has 4000 gallons of fuel before takeoff

Answer:

First, we can calculate the discount from the sale. The sweater costs $65.99, and with a 40% discount, the price is reduced by:

$65.99 x 0.40 = $26.40

So the sale price of the sweater is:

$65.99 - $26.40 = $39.59

Next, we can apply Carson's $10 coupon to the sale price:

$39.59 - $10 = $29.59

Therefore, Carson pays $29.59 for the sweater after the discounts.

To calculate the total discount that Carson receives, we can first find the amount of the 40% discount on the sweater, which is:

40% of $65.99 = 0.4 x $65.99 = $26.40

Then, we can add the additional $10 coupon discount to get the total discount:

$26.40 + $10 = $36.40

Therefore, the total discount that Carson receives on the sweater is $36.40.

To find the final price that Carson pays after the discounts, we can subtract the total discount from the original price:

$65.99 - $36.40 = $29.59

Therefore, Carson pays $29.59 for the sweater after the discounts.

At least one child made fewer than 2 greeting cards.

For a fundraiser, the children in the art club made greeting cards and kept track of how many they produced.

Children made fewer than 2 greeting cards:

To find out how many children made fewer than 2 greeting cards we need to use the data available.

Assume that there are n children in the art club who participated in the fundraiser.

For each child, the number of greeting cards that they produced is given.

The first step is to set up an inequality for each child that expresses the number of greeting cards they made.

The inequality for the ith child is given by: gᵢ ≥ 0,

where gᵢ is the number of greeting cards made by the ith child.

The second step is to add up the inequalities for each child.

This gives you the following inequality: g₁ + g₂ + ... + gₙ ≥ 0.

The third step is to use the data given in the question.

It is known that each child made fewer than 2 greeting cards.

Therefore, you can substitute 2 for each gᵢ.

This gives you the following inequality:2 + 2 + ... + 2 ≥ 0

Simplifying, we get: 2n ≥ 0

The final step is to solve for n, which is the number of children who participated in the fundraiser.

Dividing both sides of the inequality by 2, you get: n ≥ 0

Since n is a positive integer, the answer is: n ≥ 1.

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Answer:

Statistical knowledge helps you use the proper methods to collect the data, employ the correct analyses, and effectively present the results. Statistics is a crucial process behind how we make discoveries in science, make decisions based on data, and make predictions.