Oil has spilled in the ocean. The volume of oil in a spill in the shape of a cylinder of height 5 inches and radius r(t) inches is given by the formula V = 5. Which is the correct expression for dV -? dt dV = 0 dt dV dr 10T dt dt dV 10r C dt dt dV dr = 572. dt dt dV dr dh = 10T dt dt dt Suppose that the radius of the spill is expanding at a rate of 0.4 inches per second. How fast is the volume changing when the radius of the spill is 2.1 inches? Round your answer to the nearest hundreth cubic inch per second.