a1ndraChe0ra a1ndraChe0ra

14-12-2016
Mathematics

Answered

The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 4.

A32pi
B16pi
C64pi
D4pi

Verified Answer :

nobillionaireNobley nobillionaireNobley

18-12-2016

S = 4πr^2
Instantaneous rate of change = dS/dr = 8πr
At r = 4, Instantaneous rate of change = 8π(4) = 32π.

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