Answer:
28. B
29:
A. 5x-7
B. 15b+25
C. 16x^2+4x
D. 13g-20
E. 6h+23
30:
A. Constant = 103, Coefficient= 94, Variable= w
B. Constant= -3, coefficient= 18, variable= x
C. Constant= -7, coefficient = -5, variable = y
D. Constant = 16, coefficient = -24, variable = z
31:
A. x+10
B. 13-9/x
C. 9x+4
D. 4+11x