Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y varies directly with x. When x = 9, then y = 72.
A. k = 
; y = 
x
B. k = 63; y = x + 63
C. k = 9;y = 9x
D. k = 8; y = 8x
Answer: D
Mathematics
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A. f-1(x) = 
B. f-1(x) = x3 + 5
C. f-1(x) = x + 5
D. f-1(x) = x3 + 25
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A. 
B. 
C. 
D. 
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Write the following as an algebraic expression in u, u > 0.tan 
A. 
B. 
C. u2
D. 
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Simplify.7x(3x2 + 2x - 5) + 2(3x2 + 2x - 5)
A. 21x3 + 13x2 - 9x - 10 B. 21x3 + 13x2 + 9x - 5 C. 21x3 + 20x2 + 31x - 10 D. 21x3 + 20x2 - 31x - 10
Mathematics