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OpenStudy (anonymous):
Suppose that y varies directly with x and inversely with z, and y = 18 when x = 15 and z = 5. Write the equation that models the relationship. Then find y when x = 21 and z = 7 A)5z/x ; 5/3 B)5x/z ; 15 C) 6x/z ; 18 D) 6z/x ; 2
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