5.
2 answers:
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So hmm notice the picture below
the side of the river, needs no fencing, since the river is there
and thus the perimeter of the pen, is just w + w + l, or 2w+l
thus
take the derivative of P(w), set it to zero, and check for any critical points, then run a first-derivative test for any minimum
the side of the river, needs no fencing, since the river is there
and thus the perimeter of the pen, is just w + w + l, or 2w+l
thus
take the derivative of P(w), set it to zero, and check for any critical points, then run a first-derivative test for any minimum