# Use spherical coordinates. Evaluate ∭z dV, where E is between the spheres x ^ 2 + y ^ 2 + z ^ 2 = 16 and x ^ 2 + y ^ 2 + z ^ 2 = 25 in the first octant.

Question

Use spherical coordinates.
Evaluate
∭z dV, where E is between the spheres x ^ 2 + y ^ 2 + z ^ 2 = 16 and
x ^ 2 + y ^ 2 + z ^ 2 = 25 in the first octant.