The volume of a sphere as a function of radius is V(r) = 4/3r3. Find the derivative

The volume of a sphere as a function of radius is V(r) = 4/3πr3. Find the derivative of volume with respect to radius. On a geometric diagram, illustrate the volume corresponding to ΔV = V(r + Δr) - V(r). What is a geometric interpretation of this derivative? Do the units make sense?
Find the derivatives of the above functions.