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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.
>>
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