The weight of a great white shark, W pounds, is given approximately by W=0.6x^3, where x is the length of the shark in feet. Suppose that a baby shark is growing at the rate of dx/dt= 0.4 ft/day
a.) How heavy is the shark when it's 2 ft long?
b.) At what rate is it gaining weight (pounds per dat) when it is 2 feet long? 10 feet long?