Let z vary jointly with x and y. Find the constant of variation k. Then, use  to find z when x = 5 and y = 7.z = 56 when x =  and y = 7

A. k = 15; z = 490
B. k = 14; z = 525
C. k = 48; z = 1,680
D. k = 56; z = 1,960


Answer: C

Mathematics

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