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Help with creating an evaluation paper presentation


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1.I need help with an optimization problem I began by creating the cost equation which I got c(x)=20x+8y and then ...

8y and then I solved for y in the area equation and got y=8,000/x then I put that into the other equation and got 20x+64,000/x then took the derivative and got 20-64,000x^-2 and when I solved for the derivative equals 0 I got 40 radical 2 but my teacher said it is supposed to be 20 radical 15, so I do not know where I went wrong.
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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