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guajiro [1.7K]
3 years ago
7

What is 12.8% of 312.5

Mathematics
2 answers:
dem82 [27]3 years ago
6 0
312.5/x=100/12.8
<span>(312.5/x)*x=(100/12.8)*x     </span>
<span>312.5=7.8125*x       </span>
<span>312.5/7.8125=x </span>
<span>40=x </span>
<span>x=40</span>
kirill115 [55]3 years ago
3 0
40
all you have to do is multiply 312.5 • 0.128
you have to make 12.8% a decimal so you move your decimal two places to the left = 0.128
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Bill's chocolate bar is 69% cocoa. If the weight of the chocolate bar is 83 grams, how many grams of cocoa does it contain? Roun
Maurinko [17]

Answer:

Bill's bar has 57.3 grams of cocoa.

Step-by-step explanation:

The math part that your question is asking is: What is 69% of 83?

In order to use the percent 69% in a calculation, you need to change it to a decimal.

69% is 0.69

You move the decimal to the left, two places.

69% is 69.% If you don't see a decimal to start with and it is a whole number, then the decimal is starting on the right.

Move it two places to the left, you get

.69

Now MULTIPLY.

.69 × 83

= 57.27

ROUND your answer to the nearest tenth. That means only one digit to the right of the decimal.

57.27 rounds to 57.3

Bill's bar has 57.3 grams of cocoa.

8 0
2 years ago
What is the difference between the areas of a circular table with diameter 6ft and a circular table with diameter 8 ft ? Round y
miskamm [114]

Answer:

22 ft^2

Step-by-step explanation:

The area of a table with diameter 6 ft

A = pi r^2 = pi (6/2) ^2 = pi 3^2 = 9pi

The area of a table with diameter 8 ft

A = pi r^2 = pi (8/2) ^2 = pi 4^2 = 16pi

Subtract 16pi-9pi = 7pi

Using 3.14 for pi

7 * 3.14

21.98 ft^2

To the nearest square foot

22 ft^2

4 0
4 years ago
Read 2 more answers
30 min before test please help !!numbers 13 and 14
anzhelika [568]
For 13. just add all the sides.

4 + 21 + 23 + 7 + 9 = 64

For 14. multiply width and height of both shapes then add them together.

1.7 x 5.2 = 3.74 ( rectangle area )
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Add the two answers

3.74 + 4.5 = 8.24
3 0
4 years ago
At a dog competition, a dog is awarded 10 points if it runs through 4 pipes, makes 10 jumps, and walks on 2 beams. If Roofy gets
choli [55]

Answer:

Butch should be awarded with 9,2 points

Step-by-step explanation:

Roofy gets 9 points out of 10 missing only a pipe, that means that each pipe is awarded with 1 point

Ralph gets 7 points out of 10 missing one pipe ( 1 point ) and 2 points missing a beam

So points are awarded as follows

1 point by pipe              then 4 points   for    4 pipes

2 points by beam         then  4 points  for     2 beams

We just have 2 points to award 10 jumps then each jump is awarded by 0,2 points

Finally as Butch missed 4 jumps, Butch should be awarded with 9,2 points

8 0
3 years ago
Divide 33 in the ratio 3:8
guajiro [1.7K]

Answer:

9 : 24

Step-by-step explanation:

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Divide 33 by 11 to find the value of one part of the ratio

33 ÷ 11 = 3 ← value of 1 part of the ratio, thus

3 parts = 3 × 3 = 9

8 parts = 8 × 3 = 24

7 0
4 years ago
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