2. A spherical balloon is deflated at a rate of 1231.5 cm3/sec. At what rate is the radius of the balloon changing when the radius is 7 cm? (note: formula for volume of a sphere is V = >mr3) (6 points) 1 - volume = r = radius = 7 FIND 3. Grain pouring from a chute at the rate of 12 ft3 / min forms a conical pile whose height is always 4 times its radius. How fast is the height of the pile increasing at the instant the pile is 3 ft. high? (note: formula for volume of a cone is V = = mr2h ). (10 points) Ar - ists / min