In three math tests, you score 91,95, and 88 points. How many points must you score on the fourth test to have an A average, or at least 90 points?

Answers

Answer 1

Answer:

You must score 86 points on the fourth test to have an average, or at least 90 points.

What is average?

The average is calculated as the product of all values divided by all possible values. It can also be described as mean. The mean in statistics is the average value for the particular sample or collection of data. It is determined by dividing the total number of observations by the total number of observations.

Given:

In three math tests,

you score 91,95, and 88 points.

Let n be the score of the fourth test.

To find the average:

The average = (91 + 95 + 88 + n) / 4

90 = (91 + 95 + 88 + n) / 4

(91 + 95 + 88 + n) = 360

n = 360 - 274

n = 86

Therefore, the score of the fourth test is 86.

To learn more about the average;

brainly.com/question/29550341

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Answer 2

Answer: That already is a 91.1 grade average. If you want to keep that, get a 90 and above. To find your average, add all your test scores up and divide them by how many scores there are. For instance if you add all those scores up you get 274. Divide it by 3 because there are three scores and there is your average!

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The length of a rectangle is 4 units shorter than one-fourth of the width, x. Write an expression that represents the perimeter of the rectangle (use one variable and a fraction)

Answers

Perimeter is the sum all lengths of a shape. For a rectangle, the perimeter is calculated by adding the 2 lengths and 2 widths. It is expressed as:

P = 2l + 2w

From the data of the length and width above, we form an expression:

P = 2l + 2w
P = 2(w/4 - 4) + 2w
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Hank is painting his grandfather's fence. He painted 40 linear feet in 85 minutes. He still has 360 linear feet to paint. His cousins, Sam and Alex, come to help. Sam paints twice as fast and Alex paints half as fast as Hank. Find the constant of proportionality that relates the current fence painting rate? (round to nearest tenth)A) 0.9
B) 1.2
C) 1.6
D) 2.4

Answers

The correct answer for the question that is being presented above is this one: "C) 1.6." Hank is painting his grandfather's fence. He painted 40 linear feet in 85 minutes. He still has 360 linear feet to paint. His cousins, Sam and Alex, come to help. Sam paints twice as fast and Alex paints half as fast as Hank. The constant of proportionality that relates the current fence painting rate is 1.6.

Answer: 1.6

Step-by-step explanation:

k = y/x= 40 +80 +20 / 85 = 140/ 85 =1.6

Allen is building bird houses that require 1/2 feet long. How many pieces that are exactly 1/2 feet long can be made from a board that is 8 1/4 feet long?

Answers

There are 2 halfs in 1 and 1/4 can't make a half so the answer is..

16

Ruiz needs to buy a countertop for a kitchen. He calculated the area to be 16 square feet. The actual area is 15.4 square feet. What is Ruiz's percentage error? A.0.6%
B.3.75%
C.3.9%
D.6%

Answers

Percentage error $=(error)/(actual measurement) * 100$
Here error = 16 - 15.4 = 0.6
Therefore, percentage error $=(0.6)/(15.4) * 100=0.039 * 100$
=3.9%

Answer:

3.9

Step-by-step explanation:

16 - 15.4 = 0.6 ={0.6}{15.4} *100=0.039 * 100 =3.9%

What is the value for x?

Enter your answer in the box.

x = ?

Answers

The two little lines through the sides of AB and CB mean that they are the same length.

Because the two sides are the same length angle A and Angle C are also the same, so those are both 73 degrees.

The three inside angles of a triangle need to equal 180 degrees, so we know angle B would equal 180 - 73 - 73 = 34 degrees.

Now we can set the equation for angle B equal to 34 and solve for x.

6x+4 = 34

Subtract 4 from each side:

6x = 30

Divide both sides by 6:

x = 30/6

x = 5

Gina recently got a 10% raise on her salary. If Gina used to make $25 an hour, what is her new salary? $ per hour

Answers

Answer:

Her new salary is 27.50 an hour

Step-by-step explanation:

Gina used to make $25 an hour

We are given that Gina recently got a 10% raise on her salary

Increase in salary per hour =

Her new salary = 25+2.5 = 27.5 an hour

So, her new salary is 27.50 an hour

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