Solve the problem. Round amounts to the nearest tenth if necessary.Suppose that z varies jointly with x and y and that z = 1080 when x = 9 and  Find the constant of variation k. Then use z = kxy to find z when x = 3 and 

A. k = 155,520; z = 5184
B. k = 7.8; z = 234
C. k = 7.3; z = 219
D. k = 7.5; z = 225


Answer: D

Mathematics

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