Write an equation to describe the variation. Use k for the constant of proportionality.P varies jointly as R and S.
A. P + R + S = k
B. P = k + R + S
C. PRS = k
D. P = kRS
Answer: D
Mathematics
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A. 3x + 8 B. 3x + 2 C. 3x + 4 D. 3x3 + 15
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Find an equation of variation for the given situation.y varies jointly as x and w and inversely as z, and y = 
when x = 2, w = 5, and z = 20.
A. y = 
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A. 
B. 
C. not possible
D.
E.
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