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This question: 1 point(s) possible IZ A spherical balloon is inflating with helium at a rate of 400it fto / min. How fast is the balloon's radius increasing at the instant the radius is 5 At? How fast is the surface area increasing? The balloon's radius is increasing at a rate of 4 ft / min at the instant the radius is 5 ft. (Simplify your answer) The surface area is increasing at a rate of | |ft- / min at the instant the radius is 5 ft. (Type an exact answer, using it as needed.)