Use your answer to parts a and b to calculate the flux out

Question

Question: Assume r^→ = 0 . Let F^→ = r^→/||r^→||3.

(a) Calculate the flux of F^→ out of the unit sphere x² + y² + z² = 1 oriented outward.

(b) Calculate div F^→. Simplify your answer completely.

(c) Use your answer to parts (a) and (b) to calculate the flux out of a box of side 10 centered at the origin and with sides parallel to the coordinate planes. (The box is also oriented outward.)