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A glowing blue balloon with bright light emanating from a point on its surface, creating wavy energy trails against a dark background.

A glowing blue balloon with bright light emanating from a point on its surface, creating wavy energy trails against a dark background.

2. Air is being pumped into a spherical balloon at the rate of 7 cubic centimeters per second. What is the rate of change of the radius at the instant the volume equals 36Ď€? The volume of a sphere of radius r is (4/3) (pi)r^3. See more