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 = 48; z = 1680
C. k = 56; z = 1960
D. k = 14; z = 525
Answer: B
Mathematics
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