Simplify without a calculator.

1.    -6 × 2 = ______

2.    -6 × -2 = ______

3.    5 × -2 × -3 = _______

4.    -4 × -5 × -2 × 0 × -3 = _______

5.    -1 × -2 × -3 × -4 =  ________

6.    3 × -1 × -3 × 2 = _______

7.    2 × -3 × -1 × -1 = _______

8.    -4 × -2 × 2 × 2 =  _______
 
 

Evaluate the following if a = -2, b = -5, and c = -1.

9.    ab = ________

10.    abc = ________

11.    ac² = ________

12.    abc² = ________

13.    ab + ac = ________

14.    2a = ________

15.    3ac = ________

16.    10bc = ________

17.    2abc - 2cba = ________