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2 years ago

USING YOUR MATH

Mathematics

1 answer:

Eddi Din [679]2 years ago

8 0

Answer:

$area = \pi {r}^{2} \\ = \frac{22}{7} ( { \frac{22}{2} )}^{2} \\ = 380 \: sq \: feet$

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Rainbow [258]

Answer:

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Step-by-step explanation:

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s: students attendance

a: adult attendance

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We start by replacing variables in two of the equations:

$c=2a\\\\s=387-c-a=387-2a-a=387-3a$

Then, we solve the remaining equation for a:

$5c+7s+12a=2808\\\\5(2a)+7(387-3a)+12a=2808\\\\10a+(2709-21a)+12a=2808\\\\10a+12a-21a=2808-2709\\\\a=99$

Then, we solve for the other two equations:

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The attendance was 198 children, 90 students and 99 adults.

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