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I set up C(w) = 26w2 + 162/w. Took the first derivative of that, set it to 0 and tried to solve for w.

But I keep coming up with the wrong answer.

What am I doing wrong?

#6 in 4.5.png

#6 in 4.5.png

{1 point) A rectangular storage container with an open top is to have a volume of 12 cubic meters. The length of its base is twice the
width. Material for the base costs 13 dollars per square meter. Material for the sides costs 9 dollars per square meter. Find the cost of
materials for the cheapest such container. Total cost = E; (Round to the nearest penny and include monetary units. For example, if your answer is 1.095, enter $1.10 including the dollar sign and second decimal place.)

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