SOLUTION: Hai sir, please help me on this problem, " "The volume of a cube is increasing at a rate of 9 cubic centimeters per second. How fast is the surface area increasing when the leng

Question 397768: Hai sir, please help me on this problem,
"
"The volume of a cube is increasing at a rate of 9 cubic centimeters per second. How fast is the surface area increasing when the length of an edge is 4 centimeters?
a)9 cm2/s
b)8 cm2/s
c)6 cm2/s
d)None of these
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Volume of cube is ==>
==> <==> when e = 4 cm.
Now the surface area ==> sq. cm. per second.
Therefore the answer is a.
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