Remark
This is a wonderful question to get to understand signs when you multip;ly or divide.
A
(-2)*(-18) There are 2 minus signs multiplied together. That gives a plus. The answer is 36
B
4(-9) There is only 1 minus sign. An odd number of minus signs multiplied together gives a minus. The answer is -36. Put a check mark there.
C
- 6 * 6 There is only 1 minus sign. Check it off. It is -36. Check it off.
D
-72/2 Only 1 minus sign. The answer is minus. Check it off. It is - 36
E
There are an even number of minus signs. The answer is plus. Don't check it off. (-18)*2 / (-1) = (-36)/-1 = 36