1. The problem statement, all variables and given/known data The spherical head of a snowperson is melting under the HOT sun at the rate of -160 cc/h (cubic centimetres per hour.) Find the rate at which the radius is changing when the radius r=16. Use cm/h for the units. (The volume of a sphere is given by V= 4π⋅r^3/3.) I have missed the past few calculus lectures and I am afraid I am falling behind, how would I start this kind of question? I know that the volume is changing at a rate of V - 160t where t is the number of hours...but I don't know how that helps at all.