Solve the problem. Round amounts to the nearest tenth if necessary.Suppose that z varies jointly with x and y and that z = 504 when x = 7 and 
Find the constant of variation k. Then use z = kxy to find z when x = 7 and y = 4.
A. k = 3.9; z = 109.2
B. k = 4.9; z = 137.2
C. k = 4.5; z = 126
D. k = 56,448; z = 2016
Answer: C
Mathematics
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