In Problems 1-3, use cylindrical coordinates to find the indicated quantity.
1. Volume of the solid bounded by the paraboloid z = x2 + y2 and the plane z = 4
2. Volume of the solid bounded above by the sphere x2 + y2 + z2 = 9, below by the plane z = 0, and laterally by the cylinder x2 + y2 = 4
3. Volume of the solid bounded above by the sphere centered at the origin having radius 5 and below by the plane z = 4.