Simplify.

1.    -6 - 4 = ______

2.    2 - 10 = ______

3.    -4 - 2 = ______

4.    7 - 20 = ______

5.    -6 - 7 = ______

6.    -1 - 1 = ______

7.    -14 - 33 = ______

8.    5 - 43 = ______

9.    -76 - 2 = ______

10.    32 - 55 = ______

11.    125 - 334 = ______

12.    345 - 999 = ______
 

Evaluate the following if a = -6, b = -4, and c = 10

13.    -a - b = ______

14.    -c - b = ______

15.    -b - c = ______

16.    a - b = ______
 

17.    Rewrite the following problem so it has no subtraction signs:    6 - 4 - 10 + 23 - 5

                  _____________________________