6.) c - 7x when c = -4 and x = -7 *
5 points
7.) 2s - 9w when s = 7 and w = -3 *
5 points
8.) 6f- 4n - 5 when f = -8 and n = -3 *
5 points
9.) 4r + 2c -7 when r = -5 and c = 6 *
5 points
10.) 4h - n when h = 8 and n = 6 *
5 points