Application of DerivativeHard
Question
The radius of a spherical soap bubble is increasing at the rate of 0.2 cm/sec, then the rate of increase of its surface area, when the radius is 7 cm.
Options
A.12.2 π cm2/sec
B.11.2 π cm2/sec
C.10.2 π cm2/sec
D.9.2 π cm2/sec
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