A Spherical Party Balloon Is Being Inflated by Helium Pumped

question 43

Multiple Choice

A spherical party balloon is being inflated by helium pumped in at a rate 3 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 1 foot? The volume of a sphere of radius r is .

• A)0.64 feet per minute
• B)0.72 feet per minute
• C)0.76 feet per minute
• D)0.14 feet per minute
• E)0.24 feet per minute

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