Help me!

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Anonymous

Help me! 2016-01-26 04:11:38 Post No. 7811143

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Help me! 2016-01-26 04:11:38 Post No. 7811143

[Report] Image search: [iqdb] [SauceNao] [Google]

hi, i came here to find cool people who likes a math that would help me with this! don't be rude please.

If y varies directly as the square root of x and x = 25 when y = -15, find x

when y = -108.

i have been doing this exercise for hours, so please help!

>>

y(x)=a*sqrt(x)

y(25) = -15

What's a? What's the function f, such that f(y(x)) = x?

y(x) = -108

f(y(x)) = f(-108)

x = f(-108)

Plug and chug.

>>

>>7811143

X is 6

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