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3 years ago

8

Elena's daughter sold 78 boxes of Girl Scout cookies. She was told that this amount represented 20% of the troops sale. How many

boxes did the room sell

1 answer:

Assoli18 [71]3 years ago

5 0

390.

If you use cross multiplication you'll get 20x=7800,
divide both sides by 20
and you have x=390

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Step-by-step explanation:

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The volume (V) is calculated as:

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Make y the subject

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The surface area of the open box is:

$SA = x^2 + 2xy+2xy$

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$SA = x^2 + 4x*\frac{3}{x^2}$

$SA = x^2 + 4*\frac{3}{x}$

$SA = x^2 + \frac{12}{x}$

Hence, the function is:

$SA(x) = x^2 + \frac{12}{x}$

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