Hmmmm. do this..
f(x)=(4/5)*x-1
remember
g(t)=k t^n
g'=nk t^(n-1)
f(x) = 4/5x
i need to find the derivitave but i don't know how to start this one. I know the derivitave of 4 is just zero, and i know the derivative of 5x is 5. But the answer isn't 0/5. Help please.
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