suppose x is a normal random variable with mean 53 and standard deviation 12. compute the z-value corresponding to x=39

Answers

Answer 1

To compute the z-value corresponding to x=39, we use the formula for z-score:

z = (x - μ) / σ

where x is the given value, μ is the mean, and σ is the standard deviation of the normal distribution. Substituting the given values, we get:

z = (39 - 53) / 12

z = -1.17

Therefore, the z-value corresponding to x=39 is -1.17.

The z-value is a measure of how many standard deviations a given value is from the mean of the distribution. A positive z-value indicates that the value is above the mean, while a negative z-value indicates that the value is below the mean. In this case, the z-value of -1.17 indicates that the value of x=39 is 1.17 standard deviations below the mean of 53.

This information can be used to make probabilistic statements about the likelihood of observing a value of x=39 or lower in this normal distribution, such as calculating the probability using a standard normal distribution table or software.

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Related Questions

how do you know <C is a right angle without using Pythagorean theorem?​

Answers

Answer:

please see answer below

Step-by-step explanation:

6² + 8² = 36 + 64 = 100 = 10²

we could make the angle C as big or as small as we want to, but if AB is going to remain a length of 10, then C is 90°.

write z1 and z2 in polar form. (express in radians.) z1 = 4 4i, z2 = 5 − 5i

Answers

Thus, z2 in polar form is: z2 = 5√2 * (cos(-π/4) + i * sin(-π/4)).

To write z1 = 4 + 4i and z2 = 5 - 5i in polar form, we need to express them in terms of their magnitude (r) and argument (θ).

For z1 = 4 + 4i:

The magnitude (r) of z1 is given by:

|r1| = sqrt(Real^2 + Imaginary^2) = sqrt(4^2 + 4^2) = sqrt(16 + 16) = sqrt(32) = 4√2

The argument (θ) of z1 can be calculated using the arctan function:

θ1 = arctan(Imaginary / Real) = arctan(4 / 4) = arctan(1) = π/4 radians

Thus, z1 in polar form is:

z1 = 4√2 * (cos(π/4) + i * sin(π/4))

For z2 = 5 - 5i:

The magnitude (r) of z2 is given by:

|r2| = sqrt(Real^2 + Imaginary^2) = sqrt(5^2 + (-5)^2) = sqrt(25 + 25) = sqrt(50) = 5√2

The argument (θ) of z2 can be calculated using the arctan function:

θ2 = arctan(Imaginary / Real) = arctan(-5 / 5) = arctan(-1) = -π/4 radians

Thus, z2 in polar form is:

z2 = 5√2 * (cos(-π/4) + i * sin(-π/4))

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The following data shows the points scored by a basketball team during the first 13 games of the season.
{85, 94, 101, 118, 107, 110, 114, 96, 117, 105, 121, 88, 125}

Part A: Determine the best graphical representation to display the data. Explain why the type of graph you chose is an appropriate display for the data. (6 points)

Part B: Explain, in words, how to create the graphical display you chose in Part A. Be sure to include a title, axis label(s), scale for axis if needed, and a clear process of how to graph the data. (6 points)

Answers

Part A:

Best graphical representation to display data will be line graph.

Given,

Scores of basketball team during the first 13 games of the season

{85, 94, 101, 118, 107, 110, 114, 96, 117, 105, 121, 88, 125}.

Now,

The data of scores shows that the data is neither increasing constantly nor decreasing constantly.  The data also indicates that the scores of the team is varying.So for this type of data when  the scores are not constant and vary continuously the best way to represent will be through line graph.

Part B:

We can create line graph with a very simple technique.

Firstly,

On x - axis take the number of season the team has played. In our case the number is 13 so take 13 distinct points on the x - axis.

Secondly,

On y -axis take the scores of the team in each of the 13 seasons corresponding to their values at x - axis.

Then,

Plot the points on the graph for all 13 seasons .

Last step,

Join all the points in the graph with the help of ruler. This will form the required line graph of the question.

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Mark is writing an exam in propositional logic. During the exam Dr. Santos notices that Mark acting rather suspicious. Suspecting Mark of cheating Dr. Santos walks up behind Mark and notices a cheat sheet. Dr. Santos says "If you do not give me your cheat sheet then, you will fail the course" Because Mark does not want to fail, he gives Dr. Santos the cheat sheet. After reviewing the cheat sheet, Dr. Santos fails Mark. Did Dr. Santos lie to mark? Explain your answer using the truth conditions of conditional and logical equivalencies.

Answers

Based on the truth conditions of conditional and logical equivalencies, it can be concluded that Dr. Santos did not lie to Mark.

In this scenario, Dr. Santos did not lie to Mark. The statement made by Dr. Santos is a conditional statement, where the antecedent is "If you do not give me your cheat sheet" and the consequent is "then you will fail the course." In order for this conditional statement to be false, the antecedent must be true and the consequent must be false. In this case, Mark did give Dr. Santos the cheat sheet, therefore the antecedent of the conditional statement is false. As a result, the truth value of the entire conditional statement is true, even though Dr. Santos did fail Mark after reviewing the cheat sheet. Furthermore, Dr. Santos' statement can also be expressed using logical equivalencies. "If A, then B" is logically equivalent to "not A or B." Using this equivalence, Dr. Santos' statement can be rewritten as "Either you give me your cheat sheet or you will fail the course." Again, this statement is true because Mark did give Dr. Santos the cheat sheet.
Therefore, based on the truth conditions of conditional and logical equivalencies, it can be concluded that Dr. Santos did not lie to Mark.

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3. A 10-inch tall candle is lit. The
graph below shows its height after
each hour.
Height of Candle
10
2
8
9
2
4
6 8 10 12
Hours
a) Write an equation for the line of
best fit.
b) Estimate the height of the canc
after 15 hours.

Answers

3) The height after 15 hours is 5.1 inches

4) The weight after 24 weeks is 166 Ibs

What is the equation of the line?

The equation of a line can be expressed in different forms, depending on the information given. The most common forms are the slope-intercept form, point-slope form.

3) We can see that;

The slope of the graph is;

m = 6 - 10/12 - 0

= -4/12 = -0.33

Then the equation of the line is;

y = -0.33x + 10

If we now have at 15 hours then;

y = -0.33(15) + 10

= 5.1 inch

4) Again we have the slope as;

m = 235 - 238/2 -1

m = -3

y = -3x + 238

After 24 weeks we have that;

y = -3(24) + 238

= 166 ibs

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G(t)=(t+1) 2 −20. 25g What are the zeros of the function?

Answers

The zeros of the function G(t) are given by t = -1 + √(20.25g) and t = -1 - √(20.25g).

What is algebra?

Algebra is a branch of mathematics that deals with mathematical operations and symbols used to represent numbers and quantities in equations and formulas. It involves the study of variables, expressions, equations, and functions.

To find the zeros of the function G(t), we need to find the values of t that make G(t) equal to zero. So, we start by setting G(t) to zero and solving for t:

G(t) = 0

(t+1)2 - 20.25g = 0 [substituting G(t) in place of 0]

(t+1)2 = 20.25g [adding 20.25g to both sides]

t+1 = ±√(20.25g) [taking the square root of both sides]

t = -1 ± √(20.25g) [subtracting 1 from both sides]

So, the zeros of the function G(t) are given by t = -1 + √(20.25g) and t = -1 - √(20.25g).

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a 15 ¾ in. board is cut in a single cut from a 38 ¼ in board. the saw cut takes 3/8 in. how much of the 38 ¼ in board is left after cutting?

Answers

A 15 ¾ in. board is cut in a single cut from a 38 ¼ in board. The saw cut takes 3/8 in.  21 ¾ inches of the 38 ¼ inch board is left.

To find out how much of the 38 ¼ inch board is left after cutting, follow these steps:
1. Determine the total length of the cut: The cut takes 3/8 inch and removes a 15 ¾ inch board, so the total length of the cut is 15 ¾ inches + 3/8 inch.
2. Convert mixed numbers to improper fractions: 15 ¾ = (15 × 4 + 3)/4 = 63/4; 38 ¼ = (38 × 4 + 1)/4 = 153/4
3. Add the improper fractions: (63/4) + (3/8) = (63/4) + (3/8 × 2/2) = (63/4) + (6/8) = (126/8) + (6/8) = 132/8 = 16 ½ inches
4. Subtract the cut length from the original board length: (153/4) - (132/8) = (153/4) - (16 ½ × 4/4) = (153/4) - (66/4) = 87/4 = 21 ¾ inches
After cutting, 21 ¾ inches of the 38 ¼ inch board is left.

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in the schedule of cost of goods sold, which of the following is true? cost of goods available for sale

Answers

In the schedule of cost of goods sold, the cost of goods available for sale represents the total cost of all goods that were available for sale during a particular period.

The schedule of cost of goods sold is an important financial statement that shows the cost of goods that a company has sold during a particular period. The cost of goods available for sale is a key component of this statement and represents the total cost of all goods that were available for sale during the period.

The cost of goods available for sale is calculated by adding the beginning inventory to the cost of goods purchased during the period. This calculation gives the total cost of all goods that a company had available for sale during the period.

Once the cost of goods available for sale is determined, the cost of goods sold can be calculated by subtracting the ending inventory from the cost of goods available for sale. This calculation gives the cost of all goods that were sold during the period.

Overall, the schedule of cost of goods sold is an important financial statement that helps companies track their inventory and understand their cost of goods sold. The cost of goods available for sale is a critical component of this statement and represents the total cost of all goods that a company had available for sale during a particular period.

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time-use data show that married american women have cut their housework time roughly in half over the last half-century, while men have:

Answers

Over the last half-century, time-use data has shown that married American women have significantly reduced their housework time, cutting it roughly in half.

This change can be attributed to various factors such as advancements in home appliances, shifting gender roles, and increased participation of women in the workforce. On the other hand, men have gradually increased their contributions to housework during this period.
This shift in housework responsibilities can be attributed to societal changes that promote a more equitable distribution of domestic tasks between partners. As gender norms have evolved, men are increasingly taking on roles that were once predominantly associated with women, leading to a more balanced approach to housework within households. Additionally, the rise in dual-income families has necessitated a more equal division of domestic responsibilities.
In summary, over the past 50 years, married American women have seen a considerable decrease in housework time, while men have increased their contributions. This change reflects evolving gender roles and societal expectations, promoting a more equal division of labor within households.

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6) Find the value of the missing values.
1
5
139°
6
72.5%
3
a) mz1 =
b) m2 =
c) mz3 =
d) m24 =
e) m25 =
f) m26 =

Answers

(a) The value of m∠1 in the intersecting chords is 31.5⁰.

(b) The value of m∠2 in the intersecting chords is 139⁰.

(c) The value of m∠3 in the intersecting chords is 41⁰.

(d) The value of m∠4 in the intersecting chords is 93⁰.

(e) The value of m∠5 in the intersecting chords is 69.5⁰.

(f) The value of m∠6 in the intersecting chords is 69.5⁰.

What is the value of the missing angles?

The value of the missing angles is calculated by applying intersecting chord theorem, which states that the angle at tangent is half of the arc angle of the two intersecting chords.

The measure of angle 1 is calculated as follows;

arc angle opposite 72.5⁰ = 2 x 72.5⁰ = 145⁰

missing arc angle = 360 - ( 145⁰ + 139)

missing arc angle = 76⁰

m∠1 = ¹/₂ ( 139 - 76) (exterior angle of intersecting secants)

m∠1 = ¹/₂ (63) = 31.5⁰

The measure of angle 5 is calculated as;

m∠5 = ¹/₂ (139⁰)

m∠5 = 69.5⁰ (interior angle of intersecting secants)

The measure of angle 2 is calculated as;

m∠2 = 2 x m∠5 (angle at center is twice angle at circumference)

m∠2 = 2 x 69.5 = 139⁰

The measure of angle 6 is calculated as;

m∠6 = ¹/₂ (139⁰)

m∠6 = 69.5⁰ (interior angle of intersecting secants)

The measure of angle 3 is calculated as follows;

m∠3 = ¹/₂ ( (360 - 139) - 139) (exterior angle of intersecting secants)

m∠3 = ¹/₂ (221 - 139)

m∠3 = 41⁰

The measure of angle 4 is calculated as follows;

θ = 180 - (72.5 + m∠6)

= 180 - (72.5 + 69.5)

= 180 - 142

= 38

Each base angle of angle 2 = ¹/₂ (180 - 139) = 20.5⁰

= 38 - 20.5⁰

= 17.5⁰

m∠4 = 180 - (17.5⁰ + m∠5) (sum of angles in a triangle)

m∠4 = 180 - (17.5 + 69.5)

m∠4 = 93⁰

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Ms Brown's left at 9:00 a. M. Her plane landed 1 hour and 23minute later. What time her plane land

Answers

Answer:

10:23 am

Step-by-step explanation:

We Know

Ms. Brown left at 9:00 am

Her plane landed 1 hour and 23 minutes later.

What time does her plane land?

We Take

9:00 + 1:23 = 10:23 am

So, her plane landed at 10:23 am

congratulations! you have been selected as a contestant on a televised game show, and you have a chance to win the car of your dreams, hidden behind one of three doors, a, b, and c, but only if you can guess the correct door. after you choose door c, the host opens door b and shows you that there is no car behind that door. now what is your probability that the car is behind door c? what assumptions are you making to reach that judgment? would you make those same assumptions if you were actually on the game show and competing for the car?

Answers

The probability that the car is behind door C given that the host opened door B and revealed that there is no car behind it is 2/3.

In this classic scenario known as the Monty Hall problem, you initially had a 1 in 3 chance of choosing the door with the car behind it. Let's call this event A. The probability of event A is P(A) = 1/3.

After you chose door C, the host opened door B and revealed that it did not have the car behind it. Let's call this event B. The probability of event B, given that the car is not behind door C, is P(B|not C) = 1.

We are interested in the probability of the car being behind door C, given that door B was opened and revealed to not have the car behind it. Let's call this event C. We want to calculate P(C|B).

To solve the problem, we can use Bayes' theorem, which states that:

P(C|B) = P(B|C) * P(C) / P(B)

where P(B|C) is the probability of observing event B given that the car is behind door C, P(C) is the prior probability of the car being behind door C before any information is revealed, and P(B) is the probability of observing event B (i.e., the host opening door B) regardless of which door the car is behind.

Using the Law of Total Probability, we can calculate P(B) as:

P(B) = P(B|A) * P(A) + P(B|not A) * P(not A)

where P(B|A) is the probability of observing event B given that the car is behind door A, P(not A) is the probability that the car is not behind door A, and P(B|not A) is the probability of observing event B given that the car is not behind door A.

Since we know that the host opened door B and revealed that there is no car behind it, we can simplify the expression for P(B) to:

P(B) = P(B|A) * P(A) + P(B|not A) * P(not A|B)

where P(not A|B) is the probability that the car is not behind door A given that the host opened door B and revealed that there is no car behind it. We can calculate P(not A|B) using Bayes' theorem:

P(not A|B) = P(B|not A) * P(not A) / P(B)

Now we can substitute these values into the expression for P(C|B):

P(C|B) = P(B|C) * P(C) / P(B)

where P(B|C) is the probability of observing event B given that the car is behind door C. In this case, the host cannot open door C to reveal the car, so P(B|C) = 1.

P(C) is the prior probability of the car being behind door C before any information is revealed. Initially, this probability was 1/3, since there were three doors and only one car. So P(C) = 1/3.

We have already calculated P(B), which is the probability of observing event B regardless of which door the car is behind. We found that:

P(B) = P(B|A) * P(A) + P(B|not A) * P(not A|B)

where P(A) is the probability that the car is behind door A, which is also 1/3, and P(not A|B) is the probability that the car is not behind door A given that the host opened door B and revealed that there is no car behind it.

Using Bayes' theorem, we found that:

P(not A|B) = P(B|not A) * P(not A) / P(B)

We can calculate P(B|not A) as follows:

P(B|not A) = P(B and not A) / P(not A)

Since the host will always open a door with no car behind it, we know that P(B and not A) = 1/2, since there are two remaining doors after you choose door C. Therefore:

P(B|not A) = (1/2) / (2/3) = 1/3

Substituting these values into the expression for P(not A|B), we get:

P(not A|B) = (1/3) * (2/3) / P(B)

Substituting P(B|C) = 1, P(C) = 1/3, and the above expression for P(not A|B) into the expression for P(C|B), we get:

P(C|B) = (1 * 1/3) / ((1/3)(1) + (1/3)(1/3)*(2/3)) = 2/3

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PLEASE ANSWER!!

A florist charges $10 for delivery plus an additional $2 per mile from the flower shop. The florist pays the delivery driver $0.50 per mile and $5 for handling each delivery. If x is the number of miles a delivery location is from the flower shop, what expression models the amount of money the florist earns for each delivery?
write in Y=mx+b form.

Answers

Let

Per mile be x

Now

Charge:-

2x+10

Pay:-

0.5x+5

Now earning:-

y=2x+10-0.5x-5y=1.5x+5

Answer:

Y = 1.5x + 5

Step-by-step explanation:

To model the amount of money the florist earns for each delivery, we can break it down into the different components involved.

The florist charges $10 for delivery, which is a fixed fee.

This can be represented by the term "+10".

Additionally, the florist charges an additional $2 per mile from the flower shop.

This can be represented by the term "+2x", where x represents the number of miles.

The florist also pays the delivery driver $0.50 per mile and $5 for handling each delivery.

This can be represented by the term - ( 0.50x + 5 )

Putting all these terms together, the expression that models the amount of money the florist earns for each delivery is:

Y = 10 + 2x - (0.50x + 5)

Simplify.

Y = 10 + 2x - 0.50x - 5

Combine like terms.

Y = 1.5x + 5

Therefore, the expression that models the amount of money the florist earns for each delivery is Y = 1.5x + 5 in slope-intercept form (Y = mx + b form).

which value of r indicates a stronger correlation than 0.40?

Answers

A value of r greater than 0.40 indicates a stronger correlation than 0.40.

The correlation coefficient, denoted as "r," measures the strength and direction of the linear relationship between two variables. The value of r ranges from -1 to 1. When the absolute value of r is closer to 1, it indicates a stronger correlation. In this case, a value of r greater than 0.40 suggests a stronger positive correlation than 0.40.

This means that as one variable increases, the other variable tends to increase as well, and the relationship between the variables is more pronounced. For example, if the correlation coefficient is 0.60, it indicates a stronger positive correlation than 0.40. Similarly, if the correlation coefficient is 0.90, it indicates an even stronger positive correlation. On the other hand, if the correlation coefficient is negative, such as -0.60 or -0.90, it indicates a stronger negative correlation.

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PLEASE HELP I WILL MARK BRANLIEST PLEASE!!! HELP ASAP!!

1. Given: the vertices of Triangle ACD lie on center B

Select all statements that are true

A. The sim of Measure of arc AC + measure of arc CD + measure of arc DA= 180 degrees because measure of angle DAC + measure of ACD+ measure of CDA = 180 degrees.
B. The perpendicular bisector of chord AC and the perpendicular bisector of chord CD will intersect at point B.
C. Measure of Angle ADC= measure of angle ABC
D. The distance from B to A is greater than the distance from B to C
E. Center B circumscribed triangle ACD

PLEASE HELP ME AND PROVIDE EXPLANATION AND CORRECT ANSWERS GOD BLESS ♡

Answers

Since the vertices of Triangle ACD lie on center B, all the statements that are true are:

B. The perpendicular bisector of chord AC and the perpendicular bisector of chord CD will intersect at point B.

E. Center B circumscribed triangle ACD.

What is a perpendicular bisector?

In Mathematics and Geometry, a perpendicular bisector is a straight line that bisects or divides a line segment exactly into two (2) equal halves and forms an angle that has a magnitude of 90 degrees at the point of intersection.

Based on the circumscribed triangle ACD at center B, we have:

Measure of arc AC + measure of arc CD + measure of arc DA= 360°

Furthermore, the measure of angle ADC is equal to one-half the measure of angle ABC.

In conclusion, the distance from center B to A is equal to the distance from center B to C.

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olive has an aquarium full of water and fish. her aquarium is 24 in long and 12 in wide. she wants to add a 2 inch layer of colorful stone to the bottom of the aquarium. the stone is sold in 5lb bags that contain approximately 75 cubic inches of stone. how many bags will she have to buy?

Answers

Olive will need to buy 8 bags of stone to fill the acquarium.

First, we need to find the volume of the aquarium.

Since the aquarium is rectangular, we can use the formula:

volume = length x width x height

where height is the depth of the stone layer we want to add. In this case, the height is 2 inches.

volume = 24 in x 12 in x 2 in

volume = 576 cubic inches

Now we need to find how many cubic inches of stone we need. We know that we want to add a 2-inch layer of stone, and the aquarium is 24 in x 12 in, so:

stone volume = 24 in x 12 in x 2 in

stone volume = 576 cubic inches

To find the number of bags we need, we can divide the stone volume by the volume of one bag:

bags = stone volume/bag volume

bags = 576 cubic inches / 75 cubic inches per bag

bags ≈ 7.68

Since we can't buy a fraction of a bag, we need to round up to the nearest whole number. Olive will need to buy 8 bags of stone.

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Which of the following is a solution to the inequality below?
56 ≤ 3 + 69
q=11
Submit
q=2
q=3
q=1

Answers

The solution of the inequality is,

⇒ q = 11

We have to given that;

The inequality is,

⇒ 56 ≤ 3 + 6q

Now, We can simplify as;

⇒ 56 ≤ 3 + 6q

⇒ 56 - 3 ≤ 6q

⇒ 53 ≤ 6q

⇒ 8.33 ≤ q

Hence, By options, The solution of the inequality is,

⇒ q = 11

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A box contains 3 red balls, 5 black balls, and 4 white balls. Suppose a ball is drawn at random. Find the probability of each event.

A black ball is drawn and A black or white ball is drawn.

(part 2)A baseball player has a batting average of .300, which means that on average the player gets 3 hits in 10 times at bat. What is the probability this player will get a hit in the next time at bat?

Answers

The probability of drawing a black ball from the box is 5/12, while the probability of drawing either a black or white ball is 9/12.

To find the probability of an event, we divide the number of favorable outcomes by the total number of possible outcomes.

1. Probability of drawing a black ball: There are 5 black balls in the box, and a total of 12 balls. Therefore, the probability of drawing a black ball is 5/12.

2. Probability of drawing a black or white ball: There are 5 black balls and 4 white balls in the box, totaling 9 balls. The total number of balls in the box is still 12. Hence, the probability of drawing either a black or white ball is 9/12.

For the second question regarding the baseball player's batting average, we can use the given information to determine the probability of the player getting a hit in the next at-bat.

The batting average of .300 means that the player gets 3 hits in 10 times at bat. To find the probability of getting a hit in the next at-bat, we divide the number of hits by the total number of at-bats. In this case, the probability of getting a hit is 3/10 or 0.3. Therefore, the probability that the player will get a hit in the next at-bat is 0.3 or 30%.

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3(1/4-2)+|-7| CAN YOU SOLVE THIS ASAP

Answers

The solution to the given expression 3(1/4 - 2) + |-7| is 7/4.

The expression is given as follows:

3(1/4 - 2) + |-7|

To solve the given expression, we need to follow the order of operations, which is PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).

First, we need to simplify the expression inside the parentheses:

1/4 - 2 = -7/4

Next, we can simplify the expression by multiplying 3 by -7/4:

3(-7/4) = -21/4

Finally, we need to evaluate the absolute value of -7:

|-7| = 7

Substituting the values into the original expression, we get:

3(1/4 - 2) + |-7| = -21/4 + 7

Combining like terms, we get:

3(1/4 - 2) + |-7| = -21/4 + 28/4

Simplifying, we get:

3(1/4 - 2) + |-7| = 7/4

Therefore, the solution to the expression 3(1/4 - 2) + |-7| is 7/4.

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The complete question is as follows:

Solve the below expression

3(1/4 - 2) + |-7|

what is the (approximate) mass of air in a typical room with dimensions 5.7m×3.9m×3.0m5.7m×3.9m×3.0m ?

Answers

The approximate mass of air in a typical room with dimensions 5.7m × 3.9m × 3.0m is about 80.14 kg.

How we find the approximate mass?

To calculate the approximate mass of air in a typical room with dimensions 5.7m × 3.9m × 3.0m, we need to find the volume of the room first. The volume of the room is given by:

Volume = length x width x height = 5.7m x 3.9m x 3.0m = 66.78 cubic meters

Assuming that the air in the room has a density of approximately 1.2 [tex]kg/m^3[/tex], we can use the formula:

Mass = Density x Volume

where density is in kg/m^3 and volume is in cubic meters.

Substituting the values, we get:

Mass = [tex]1.2 kg/m^3 x 66.78[/tex] cubic meters

Mass ≈ 80.14 kg

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8. the solution of the initial-value problem x'= (-1 1)x, x(0) = (-2, 5)

Answers

the solution to the initial-value problem is:

x(t) = (-4.5e^(-t) + 2.5e^(t), 5e^(t)).

To solve the initial-value problem x' = (-1 1)x, x(0) = (-2, 5), we can use the matrix exponential method.

First, we find the eigenvalues and eigenvectors of the coefficient matrix (-1 1):

| -1  1 |
|       | = (λ + 1)(λ - 1) = 0
|  0  -1|

The eigenvalues are λ = -1 and λ = 1.

For λ = -1, we have:

| 0 1 |
|     | v = 0
| 0 0 |

This gives us the eigenvector v1 = (1, 0).

For λ = 1, we have:

| -2 1 |
|      | v = 0
|  0 0 |

This gives us the eigenvector v2 = (1, 2).

We can then write the general solution as:

x(t) = c1 * e^(-t) * v1 + c2 * e^(t) * v2

where c1 and c2 are constants to be determined from the initial condition x(0) = (-2, 5).

Substituting t = 0 and equating coefficients, we get:

x(0) = c1 * v1 + c2 * v2
(-2, 5) = c1 * (1, 0) + c2 * (1, 2)
-2 = c1 + c2
5 = 2c2

Solving for c1 and c2, we get:

c1 = -2 - c2 = -2 - (5/2) = -9/2
c2 = 5/2

Therefore, the solution to the initial-value problem is:

x(t) = (-9/2) * e^(-t) * (1, 0) + (5/2) * e^(t) * (1, 2)

Simplifying this expression, we get:

x(t) = (-9/2) * (e^(-t), 0) + (5/2) * (e^(t), 2e^(t))
    = (-4.5e^(-t) + 2.5e^(t), 5e^(t))

So the solution is x(t) = (-4.5e^(-t) + 2.5e^(t), 5e^(t)).

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Dilate quadrilateral abcd using center b and scale factor 1/2

Answers

The dilated quadrilateral, using center B and a scale factor of 1/2, is A'B'C'D'.

To dilate a quadrilateral ABCD using center B and a scale factor of 1/2, we can follow these steps:

Draw line segments from the center of dilation (B) to each vertex of the quadrilateral (A, C, and D).

Measure the distance from B to each vertex (AB, BC, BD) and multiply each distance by the scale factor (1/2).

From the endpoints of the original line segments, construct new line segments with the scaled distances obtained in the previous step.

Connect the endpoints of the newly constructed line segments to form the dilated quadrilateral A'B'C'D'.

The resulting quadrilateral A'B'C'D' will be a scaled-down version of the original quadrilateral ABCD, with center B as the center of dilation and a scale factor of 1/2.

Note: Since I am a text-based AI and cannot provide visual illustrations, it would be helpful to refer to a geometric software or draw the quadrilateral on paper to visualize the steps described above.

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Find the surface area of the sphere. Round your answer to the nearest hundredth.
C-4r ft
The surface area is about
square feet.

Answers

The surface area of the sphere is about 50.27 square feet.

The formula for the surface area of a sphere is:

Surface area = 4πr²

The circumference of the sphere as C = 4r ft.

The radius of the sphere as follows:

C = 2πr

4r = 2πr

r = 2 ft

The radius of the sphere can use the formula for surface area to find the answer:

Surface area = 4πr²

Surface area = 4π(2²)

Surface area ≈ 50.27 square feet

Rounding the answer to the nearest hundredth, we get:

Surface area ≈ 50.27 square feet (rounded to two decimal places)

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find vectors w1 and w2 so that s will be the transition matrix from [w1, w2] to [v1, v2]

Answers

To find vectors w1 and w2 so that s will be the transition matrix from [w1, w2] to [v1, v2], you need to follow these steps:

1. First, arrange the given vectors v1 and v2 in matrix form, let's call this matrix V:
  V = |v1 v2|

2. Next, arrange the unknown vectors w1 and w2 in matrix form, let's call this matrix W:
  W = |w1 w2|

3. Your goal is to find the transition matrix S, which when multiplied with matrix W will give you matrix V:
  S * W = V

4. To find the transition matrix S, you need to multiply both sides of the equation with the inverse of matrix W:
  S = V * W⁻¹

5. Now, calculate the inverse of matrix W (W⁻¹), and multiply it with matrix V to obtain the transition matrix S.

Keep in mind that we cannot provide specific numerical values for w1 and w2 without knowing the values of v1 and v2. However, by following these steps, you can find the vectors w1 and w2 that correspond to the given transition matrix S from [w1, w2] to [v1, v2].  

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ellen renovates his square farmhouse foyer that has a side of 15 feet. calculate the area of the foyer.

Answers

Ellen renovates his square farmhouse foyer that has a side of 15 feet. Therefore, the area of Ellen's square farmhouse foyer is 225 square feet.

The area of Ellen's square farmhouse foyer, with a side of 15 feet, is 225 square feet.

To find the area of a square, you need to multiply the length of one side by itself.

In this case, the side of the square foyer is 15 feet, so you simply need to multiply 15 by 15.

15 x 15 = 225

Therefore, the area of Ellen's square farmhouse foyer is 225 square feet. This measurement can be useful for determining how much flooring, paint, or other materials are needed to complete the renovation project.

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When counting on to find a money amount, why is it helpful to
begin counting with the coins that have the greatest value?

Answers

The reason to count larger coins first is discussed below.

Beginning counting with the coins that have the greatest value is helpful when counting on to find a money amount because it ensures that the largest possible value is counted first, which can simplify the process and reduce the chance of error.

By starting with the coins that have the greatest value, one can quickly determine the maximum number of each coin needed to reach the desired amount, and then fill in any remaining amount with smaller value coins if necessary.

This can save time and effort compared to starting with smaller value coins and having to make multiple counts and adjustments to reach the desired amount.

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Please help me with this math problem!! Will give brainliest!! :)

Answers

Answer:

Because the cake pan holds 234 in.³ and the four round cake pans hold a total of around 226.19 in.³

Edit: I multiplied the diameter as the radius. Answer has now been corrected.

Step-by-step explanation:

To solve this, we need to figure out how much each batter can hold.

Cake Pan

For this one, the formula is simple. we multiple everything together to get the volume.

13×9×2=234 in.³

Four Round Cake Pans

For this one, you will have to use pi or π. A round cake pan is most likely a cylinder. Therefore, we will use the cylinder volume formula, which is:

V=πr²h

V=π(3)²(2)

V=π(9)(2)

V=18π

V is around 56.5486678 or 56.55. However, if you are using 3.14 for π, you will get something else, 56.52.

But remember that this is only one cake pan. There are 4 of them. So, we can simply multiple the number by 4. To help this be more accurate, I will go back to 18π first.

V=18π(4)

V=72π

=226.194671058

or around 226.19.

If you are using 3.14, just multiply by 3.14 instead of π. You will get a very similar result, with only a minor difference. It all depends on which one you are using.

Good luck with your homework! If this is correct, please give me brainliest :)

Answer:

rectangular pancake pan: 234 in³4 round pans: 226.2 in³

Step-by-step explanation:

You want to know the volumes of a 13×9×2 inch rectangular cake pan, and of four 2-inch deep round cake pans 6 inches in diameter.

Volume formulas

The volume of the rectangular cake pan is given by ...

  V = LWH

  V = (13 in)(9 in)(2 in) = 234 in³

The volume of four round cake pans with diameter d is given by ...

  V = 4×(π(d/2)²h) = πd²h

  V = π(6 in)²(2 in) = 72π in³ ≈ 226.2 in³

Comparison

The rectangular pan holds more cake batter.

The cake pan holds 234 in³, and the four round pans hold 226.2 in³.

__

Additional comment

You often see the formula for the volume of a cylinder as ...

  V = πr²h

Since r = d/2, and the diameter is given here, we used the diameter in the formula above. We also made the formula apply to four (4) cake pans, which simplified our math.

#95141404393

bag a contains 3 red balls and 1 blue ball. a bag b contains 1 red ball and 1 blue ball. a ball is randomly pickedfrom each bag. the ball from bag a is the placed into bag b and the ball from bag b is placed into bag a. what isthe expected number (or mean) of red balls in the bag a?

Answers

Bag A contains 3 red balls and 1 blue ball. a bag b contains 1 red ball and 1 blue ball. a ball is randomly picked from each bag. the ball from bag A is then placed into bag b and the ball from bag b is placed into bag A. On average, we can expect bag A to have 5/8 red balls after the switch.

To calculate the expected number of red balls in bag A, we need to consider all the possible outcomes and their probabilities.
First, we can determine the probability of picking a red ball from bag A, which is 3/4. The probability of picking a blue ball from bag A is 1/4. Similarly, the probability of picking a red ball from bag B is 1/2, and the probability of picking a blue ball from bag B is also 1/2.
Next, we need to consider all the possible outcomes of switching the balls between the bags. If we pick a red ball from bag A and a blue ball from bag B, we will switch them so that bag A now has 2 red balls and 1 blue ball, while bag B has 2 blue balls. If we pick a blue ball from bag A and a red ball from bag B, we will switch them so that bag A still has 3 red balls and 1 blue ball, while bag B now has 1 red ball and 2 blue balls.
Therefore, the expected number of red balls in bag A can be calculated as follows:
(3/4 x 1/2) x 2 red balls + (1/4 x 1/2) x 3 red balls = 5/8 red balls

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find f(-3) for f(x)=4(2)x

Answers

f(-3) for the function [tex]f(x) = 4(2)^x[/tex] is equal to 1/2.

To find f(-3) for the given function.

Using the provided function, f[tex](x) = 4(2)^x:[/tex]
Identify the function:[tex]f(x) = 4(2)^x[/tex]
Replace x with[tex]-3: f(-3) = 4(2)^{ (-3)[/tex]
Simplify the exponent: [tex]2^{(-3)} = 1/(2^3) = 1/8[/tex]

Multiply by the coefficient: [tex]4 \times  (1/8) = 4/8[/tex]
Finally, simplify the fraction:
f(-3) = 4/8 = 1/2
Note: An exponent is a number that represents how many times a base number should be multiplied by itself.

It is denoted by a superscript to the right of the base number, such as in [tex]2^3,[/tex]

where 2 is the base and 3 is the exponent.

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7. What is the area of the given circle in terms of pi?
check down below for picture.

Answers

The area of the circle in terms of pi, with a diameter of 9.6 meters, is 23.04π square meters.

The diameter of a circle is twice the radius, so if the diameter is 9.6 meters, then the radius is half of that, or:

r = 9.6 / 2 = 4.8 meters

The area of a circle is given by the formula:

A = πr²

Substituting in the value of r, we get:

A = π(4.8)²

Simplifying the expression by squaring 4.8, we get:

A = π(23.04)

So the area of the circle is:

A = 23.04π square meters

Therefore, the area of the circle in terms of pi, with a diameter of 9.6 meters, is 23.04π square meters.

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