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A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross-section) of 108 inches. Find the dimensions of the package of maximum volume that can be sent. (Assume the cross-section is square.)
Answer
108 – 4x*y
108-4x=y
There is a max at x = 18 because A'(x) = 0. There is a min at x = 0.
Result
X=18
y(x)=108-4(18)=36
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