A tank in the shape of an inverted cone frustum has cross-sections of radius 2 + -y feet at an altitude of y feet above the base. If its height is 5 ft and it is filled with water, how much work is done to pump all of the water out over the top of the tank? The weight density of water is 62.4 1b/ ft. Round your answer to two decimal places. Radius of cross-section Tank height y Answer Keypad