I'm stuck on these last 3 problems. Please help and include explanations for me.

10. Let D be the solid inside the cylinder r = cos 0, above the xy-plane and under the paraboloid z = 9 - x2 - y2. Calculate S J JzdV and assign the result to q10. 11. Let D be the solid inside the cone z = vx2 + y, inside the sphere x2 + y + z = 9 and above the plane z = 1. Calculate J J J z2dV and assign the result to q11. 12. Plot the portion of x2 + z = 9 above the xy-plane and between y = 1 and y = 5. Make sure you use the single figure command before plotting. Assign the result from the fsurf command to q12