When the radius is doubled, the volume of a cylinder quadruple
You close a question with a question mark..right?
Ok first we can split it in two :

and

.
The derivative of

is 3.
For the first part, we use the chain rule :
![[f(g(x))]'=g'(x)f'(g(x))](https://tex.z-dn.net/?f=%5Bf%28g%28x%29%29%5D%27%3Dg%27%28x%29f%27%28g%28x%29%29)
hence

(since the derivative of the exponential is itself) hence
Answer: Answer to be MAY be 18, I don't know. Just a guess.
Step-by-step explanation