Digital SAT Math Practice Question #2263
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Desmos Hack: Type the expression into Desmos directly to locate vertices, roots, and intersections effortlessly.
Perimeter $2l + 2w = 40 \implies l + w = 20 \implies w = 20 - l$. Area $A(l) = l(20 - l) = -l^2 + 20l$. Maximum occurs at $l = 10$, giving area $10 \times 10 = 100$ m$^2$ (a square)....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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