Hi all, first time here. Not sure whether this is the right category...

I am working with water levels and a truncated cone.

I have been told that V = (pi/3)(((x+2)^3)/4)-2000).

I am then told to find dV/dx, which = (pi(x^2+40x+400)/4).

This is where I am stuck, because it then asks "Hence find the rate of change of height (x) in terms of x.

Would I use Chain Rule, or is it simply dV/dx inverse?

I'm not sure at all.

Thanks for the help.