Hi I am having difficulty with the following question

2. Using cylindrical polar co-ordinates r, theta , z, evaluate

∫∫∫B z^7 dV; where B is the finite body between the plane z = 0 and the paraboloidal surface S : z = 36 − x^2 − y^2.

I have managed to find the limit of theta which is 2pi and 0, but I am struggling to find it for r and z. For z I think one of the limits is 36-r^2 and the other limit for z is 0 (do you think this is right), also what would the limits of r be ( would it be 6 and -6 or 6 and 0)