$A = -l^2+70l$
Work Step by Step
$A = l*w$ $P = 2w+2l$ $140 = 2(w+l)$ $140/2 = 2(w+l)/2$ $70 = w+l$ $70-l = w+l-l$ $70-l = w$ $A = l*w$ $A = l *(70-l)$ $A = 70l-l^2$ $A = -l^2+70l$
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