​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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