Let V be the region bounded by the planes x=0, y=0 and z=2, and the surface which is a paraboloid, lying in the quadrant . Integrate , choosing the appropriate limits, first in the order dx dy dz and then in the order dz dy dx, showing that the answer comes out the same both times. Then change to cylindrical polar coordinates and do the same".

Basically I have tried this and the outcome is wrong. I think I am choosing the limits wrong but I can't see why. For the first I did: z between 0 and , y between 0 and and then x between 0 and . For the second, I did: x between 0 and , y between 0 and and z between 0 and 2. Forget the cylindrical polars for the time being, I would like to first get to grips with the normal coordinates versions. Please can someone tell me whether any of what I did is right, and if so, which parts are wrong? What should the limits of integration be?