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worty [1.4K]
3 years ago
8

Chris finds a mass of 47/100 gram for a rock sample. Dana finds a mass of 3/10 gram for his sample. Use fractions feom the list

to complete an equation and find the total mass of both samples. 3/10, 4/10, 7/10, 3/100, 30/100, 40/100, 47/100, 50/100, 77/100
Mathematics
1 answer:
soldier1979 [14.2K]3 years ago
4 0
So when adding fractions your goal is to match the denominators. By this I mean you want to have the same number on the bottom for both fractions. So when adding, you cannot take away from 47/100, you can only add on to 3/10.
So here's a little help;

47/100 + 3/10 

Now we are going to work with 3/10, our goal is to get 10 to match with 100. Meaning we multiply it by 10.
Now we have this:

47/100 + 3/100

But what ever you do to the bottom you must do to the top. So now you multiply 3 by 10 and now you have this:
47/100 + 30/100

Now we can simply just straight up add these.

47/100 + 30/100 = 77/100.

And there's your answer. I hope that helped.
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The answer is:  "10 cm" .
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Method 1)
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2L + 2w = 40 ;  Since the formula for perimeter of a rectangle (Note: a square is a rectangle) is:

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 Factor out a "2":
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" 2L + 2w = 40" ;

2 (L+ w) = 40;

Divide each side of the question by "2" ;
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         [2 (L + w)] / 2  = 40 / 2 ;
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 to get:  (L + w) = 20 ;

Note:  this "rectangle is a square" ; so L= w".
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20 /2 = 10 ;

L + w = 10 + 10 = 20.

This is a square, so each side of the square is the same length.

Each side is:  10 cm .
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Method 2)
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We are given: The perimeter (sum of the lengths of all sides) of a square is "40 cm."  Since a square has 4 sides of equal length:
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