Solve the problem.The length of the diagonal of a rectangle is given by 
where L and W are the length and width of the rectangle. What is the length of the diagonal, D, of a rectangle that is 42 inches long and 7 inches wide? Round your answer to the nearest tenth of an inch, if necessary.
A. 17.1 in.
B. 42.6 in.
C. 41.4 in.
D. 7 in.
Answer: B
Mathematics
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A. 
B. 
C. 
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A. {3} B. {3, -9} C. {9, -3} D. no solution
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