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A Spherical Balloon Is Being Inflated S=4πr2S = 4 \pi r ^ { 2 }

Question 30

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A spherical balloon is being inflated. Find the rate of increase of the surface area S=4πr2S = 4 \pi r ^ { 2 } with respect to the radius rr when r=1ftr = 1 \mathrm { ft } .

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