4. A 20 ft ladder is leaning against a wall and the base is slipping away from the wall at a rate of 2 ft/sec. How fast will the top of the ladder be moving down the wall when the base is 4 ft from the wall? a2 + 62 = c2 5. A paper cup in the shape of a cone is 12 cm tall with a diameter of 12 cm. The bottom of the cup is punctured so that the water leaks out at a rate of 25x cm3/sec. At what rate is the water level changing with the water level is 5 cm? Vcone = =arch