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The Lengths of the Edges of a Cube Are Increasing

Question 74

Multiple Choice

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

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