Helium is pumped into a spherical balloon at a rate of 2 cubic feet per second. How fast is the radius increasing after 2 minutes, assuming that the ballo started with a volume of 0? Note: The volume of a sphere is given by V = (4/3) 173. Rate of change of radius (in feet per second) = 624bb8eb99c47c003f730a68 #O Pause Healey Library - U... Learn Python for.. Related Rates Problems OPEN Turned in automatically when late period 9 attempts remaining. The radius of a spherical balloon is increasing at a rate of 4 centimeters per minute. How fast is the surface area changing when the radius is 10 centimeters? Hint: The surface area is S = 4mr2. Rate of change of surface area =