Solve the problem.A piece of rectangular sheet metal is 18 inches wide. It is to be made into a rain gutter by turning up equal edges to form parallel sides. If the length of each parallel side is x inches, what value of x will maximize the rain gutter's cross-sectional area (and thus maximize the amount of water the gutter will hold)? If necessary, round to the nearest hundredth.
A. 4.5 in.
B. 9 in.
C. 72 in.
D. 36 in.
Answer: A
Mathematics
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?
?
A. 
B. 
C. 
D. 
E. 
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