Problem 3. (12 points) Compute the volume of the region bound underneath the surface z = 4 - x2 - y with sides x = 0, y = 0, z = 0, in the first octant.Problem 7. (10 points) Use spherical coordinates to set up (but DO NOT EVALUATE) an integral for the volume of the region bound below the sphere x2 + y + 22 = 1 and above the cone