Air is escaping from a spherical ballon at the rate of 49 cm per minute. How fast is the surface area shrinking when the radius is 7 cm? For a radius r, the volume of a sphere is V = 4. is A = 4xr2. 3 Tr and the surface area of a sphere (A) 40 cm² per minute (B) 7 cm2 per minute (C) 14 cm2 per minute (D) 21cm² per minute (E) 28 cm? per minute (F) 35 cm2 per minute

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