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# Thank you!) The lengths of the edges of a cube are increasing at a rate of 6ft/min.

Please help me with these questions, and show me step by step on how you got the answer. Thank you!

1.) The lengths of the edges of a cube are increasing at a rate of 6ft/min. At what rate is the surface area changing when the edges are 21ft long?

Recall S= 6X^2

2) Find y'

y= 3^(2x^2+x)