Solve the problem.You have 120 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river, find the length and width of the plot that will maximize the area.
A. length: 60 feet, width: 60 feet
B. length: 30 feet, width: 30 feet
C. length: 60 feet, width: 30 feet
D. length: 90 feet, width: 30 feet
Answer: C
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