Can somebody help on #22 ASAP? Please explain as well! ;)

Answers

Answer 1

Answer: to find the answer all you have to do is subtract 130 to 78

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david spent 2/5 of his money on a storybook. The storybook cost $20. How much money did he have at first

Answers

If the storybook cost $20, and it was also 2/5 of his money, then 2/5 of his money is $20. In other words:
2x/5 =20.

Multiplying both sides by 5, we get:
2x = 100.

If we divide both sides by 2, then we're left with:
x = 50.

David had $50 at first.

50 dallors hope this help

Determine the standard deviation of the data below. (1, 2, 3, 4, 5)a) √2
b) 3
c) 2

Answers

C!
Have an amazing day!

Answer:

sqrt(2)

Step-by-step explanation:

1. Find the mean.

Mean=1+2+3+4+5=15/5=3

2. Subtract each number by the mean and square the value.

1-3=-2^2=4

2-3=-1^2=1

3-3=0^2=0

4-3=1^2=1

5-3=2^2=4

3. Add the values in step 2 then divide by amount of numbers.

4+1+0+1+4=10/5=2

4.Square the value in step 3 and that is the answer.

sqrt(2)

Richard practiced piano each of 3 piano solos for 5/12 hour. How long did he practice in all? Please show how to figure

Answers

3 piano solos....each is 5/12 hr....
u can either add : 5/12 + 5/12 + 5/12 = 15/12 = 1 1/4 hrs

or u could multiply : 3 * 5/12 = 15/12 = 1 1/4 hs

either way....same answer

the perimeter of a picture frame is 24 inches if the width of the picture frame 5 inches what is the length of the picture frame

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You would divide 24 by 5 so the length would end up being: 4.8 in
Hope it helps!

In Mrs Phillips math class the ratio of boys to girls is 4 to 2. If there are 51 girls in math class, how many boys are there?

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So for every two girls, there's four boys. There are twice as many boys than girls, so the number of girls • 2 = your answer.

51 • 2 = 102

ALLISON bought a snack using 47 cents in coins shown. write a decimal to show what part of a dollar she spent

Answers

A dollar ia written $1.00 if it says 47 cents you'd put it behind the decimal so it would be 0.47

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Dels anyone know this? (Im just starting algebra now