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Helium is pumped into a spherical balloon at a rate of 3 cubic feet per second. How fast is the radius increasing after 3

Helium is pumped into a spherical balloon at a rate of 3 cubic feet per second. How fast is the radius increasing after 3 minutes? Note: The volume of a sphere is given by V = (4/3)r. Rate of change of radius (in feet per second) = 2

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