?The lengths of the edges of a cube are increasing at a rate of 4 ft/min. At what rate is the surface area changing when the edges are 21 ft long?
?
A. ?96 ft2/min
B. 1,008 ?ft2/min
C. 504 ?ft2/min
D. ?2,016 ft2/min
E. ?84 ft2/min
Answer: B
Mathematics
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