Find an equation of variation in which the following are true.y varies jointly as x and z, and y = 405 when x = 9 and z = 9
A. y = 
B. y = 45x
C. y = 5xz
D. y = 7xz
Answer: C
Mathematics
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?
?
?
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Fill in the blank(s) with the appropriate word(s).
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