Solve the problem.Suppose that y is directly proportional to x and that y = 24.5 when x = 7. Find the constant of proportionality k. Then, find y when x = 18.
A. k = 171.5; y = 
B. k = 3.25; y = 58.5
C. k = 3.5; y = 81
D. k = 3.5; y = 63
Answer: D
Mathematics
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