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0 votes
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in Applications of Differential Calculus by (47.0k points)
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If the volume of an expanding cube is increasing at the rate of 4cm3/sec then the rate of change of surface area when the volume of the cube is 8 cubic cm is …

(a) 8cm2/sec 

(b) 16cm2/sec 

(c) 2cm2/sec 

(d) 4cm2/sec

1 Answer

+1 vote
by (49.2k points)
selected by
 
Best answer

(a) 8cm2/sec

Let the volume of the cube 

Let surface area of the cube S = 6a2

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