alleryStart learning →A farmer has 40 m of fencing for a rectangular plot. What is the largest area it can enclose?
A120 m^2
B100 m^2
C80 m^2
D96 m^2
Answer & Solution
Correct answer: B. 100 m^2
With sides x and 20 - x the area is x(20 - x), maximal at x = 10 where it equals 100 m^2.
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