A spherical balloon is being inflated. Find the rate of increase of the surface area S with respect to the radius r when r = 4 ft. S = 4?r2 S'(4) =    ft2 /ft

Elementary Geometry for College Students
6th Edition
ISBN:9781285195698
Author:Daniel C. Alexander, Geralyn M. Koeberlein
Publisher:Daniel C. Alexander, Geralyn M. Koeberlein
Chapter8: Areas Of Polygons And Circles
Section8.4: Cicumference And Area Of A Cicle
Problem 45E: The diameter of a carousel merry-go-round is 30ft. At full speed, it makes a complete revolution in...
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A spherical balloon is being inflated. Find the rate of increase of the surface area S with respect to the radius r when r = 4 ft.

S = 4?r2
S'(4) =    ft2 /ft 
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