Can anyone help with my algebra homework?

1. Simplify
-23.9a + 46.8 + 42.6a - 26b - 18.7a
A) 52a - 26b + r6.8
B) -26b + 46.8
C) -18.7a - 26b + 46.8
D) 23.9a - 26b + 46.8

2) simplify -10 + 3r + 2r^2 - r
A) r^2 - 10 - 2r
B) 2r^2 + 2r - 10
C) 2r^2 - 2r - 10
D) r^2 -10 + r

3) simplify -2b + 7 - 2a +5b -6a
A) -8a + 3b +7
B) 8a - 3b + 7
C) -4a + 7b + 7
D) 4a - 3b + 7

4) simplify 24 - 4 (5y -6z) + 3y -7z
A) -23y + 31z + 24
B) -17y - 31z + 24
C) 23y + 17z + 24
D)-17y + 17z + 24

5) simplify 14.2 + 6.5 (p + 3q) - 4.05q
A) 6.5p - 15.45q + 14.2
B) 6.5 + 23.55q + 14.2
C) 6.5p + 15.45 + 14.2
6.5p - 23.55q + 14.2

6) simplify
A) 18f - 12s - 20
B) 20f + 12s - 20
C)20f - 22s -20
D) 18f + 12s - 20