1. A spherical balloon is being filled with helium such that its radius is changing at a constant rate of 2 cm/sec. Answer the following, where the volume of a sphere is V = T r3 and the surface area of a sphere is S = 4 r r² . (a) How fast is the volume changing when the radius of the balloon is 10 cm? (b) How fast is the material of the balloon stretching when its diameter is 30 cm?

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Q: Help with word problems

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