A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.1 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 14 cm.
Your answer (cubic centimeters per minute) should be a positive number.
Hint: The volume of a sphere of radius $r$ is $$V = \frac{4\pi r^3}{3}.$$ The diameter is twice the radius.