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Vlad1618 [11]
2 years ago
10

The ratio of the number of math books to the number of comic books on a shelf is 7:3. There are 21 comic books on the shelf. Fin

d the number of math books on the shelf.
Mathematics
2 answers:
Sauron [17]2 years ago
7 0

Answer:

There are 49 math books on the shelf.

Step-by-step explanation:

math books : comic books

       7           :         3

       x           :        21

21÷3=7

7*7=49

x=49

NNADVOKAT [17]2 years ago
3 0

Answer:

49

Step-by-step explanation:

Let the number of math books on the shelf be x.

7:3\\x:21

Cross multiply the ratio and solve for x.

3x=7 \times 21\\3x=147\\x=49

There are 49 math books on the shelf.

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solong [7]

Answer:

a=8

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Step-by-step explanation:

solve simultaneously:

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3 years ago
In a right triangle, if the length of the hypotenuse is 39 and the length of one of the other sides is 15, what is the length of
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3 years ago
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vredina [299]
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5 0
3 years ago
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vladimir1956 [14]
Um.. Both of those equations are the exact same. Divide both sides of the first equation by 6. You get:

\frac{30x  - 42y}{6} = \frac{-6}{6} \\ 5x - 7y = -1

That is the exact same as the second equation. This system has an infinite number of solutions. 5x - 7y = -1 is a line, so basically every point on that line is a solution to the system.

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4 0
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Answer:

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Step-by-step explanation:

Common ratio =

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3 years ago
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