The lengths of the edges of a cube are increasing at a rate of 9 ft/min. At what rate is the surface area changing when the edges are 16 ft long?
?
A. 972 ft2/min
B. 1,728 ft2/min
C. 3,072 ft2/min
D. 486 ft2/min
E. 7,776 ft2/min
Answer: B
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