A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.1 chin. Assume that the snowball remains perfectly spherical as it melts. At what rate is the volume of the snowball decreasing when the diameter is 15 cm? Recall that the volume of a sphere is given by the formula V = m'x. (Note that the answer is a positive number, since you are being asked for a rate of decrease). cmsfmin