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Southrop · Answer 1 · 2017-07-11T20:53:51+0000

w=width of the pasture, and
320000/w=length (parallel to river)
F=twice width + length
=2w + 320000/w

Find derivative of F with respect to w and equate to zero to find w.
i.e.
Solve for w in
dF/dw=0
hope it helps

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