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Mathematics, 05.05.2020 08:10 boo6931

David has 400 yards of fencing and wishes to enclose a rectanghlar area against a pre-existing fence.
What equation should David use to help. him maximize the area?
f(x)=x(400-2x)
f(x)=x(400+2x)
f(x)=2x(400-x)
f(x)=2x(400+x)

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