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H8-13 Helium is pumped into a spherical balloon at a rate of 2 cubic feet per...

H8-13

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? Note: The volume of a sphere is given by V = (4/3)πr3 .

Rate of change of radius (in feet per second) =

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