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A spherical balloon is inflating with helium at a rate of 320x ft / min. How fast is the balloon's radius increasing at the instant

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A spherical balloon is inflating with helium at a rate of 320x ft / min. How fast is the balloon's radius increasing at the instant the radius is 4 ft? How fast is the surface area increasing? The balloon's radius is increasing at a rate of ft / min at the instant the radius is 4 ft. (Simplify your answer.)

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