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7 November, 17:33

Organizers of an outdoor concert will use 320 feet of fencing to fence off a rectangular VIP section. What is the maximum area that they can fence off? A) 3,200 square feet B) 6,400 square feet C) 12,800 square feet D) 24,000 square feet

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  1. 7 November, 19:12
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    2 (l+w) = 320

    l+w = 160

    l=160-w

    lw=A

    160w-w² = A

    w²-160w+A=0

    w max = - b / (2a) = 160/2 = 80 ft

    Max A = 160 (80) - (80) ² = 6400 ft²

    So B is correct
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