You're given restrictions on the region R: . This defines the x and y limits of integration.
Do you think you can set up the volume integral now?
--Chris
Generalising:
When you have a volume bounded above by z = f(x,y) and below by z = g(x,y), then where is the region in the xy-plane that the volume projects onto.
Note: In this question, and so the volume is given by , the result given by Chris L T521.