Question 272931
if a is a negative number means -a

Plug -a into each of the answers to see which one it changes

-3(-a)=3a  Multiplying two negatives makes a positive
-a/5=-a/5  Dividing one negative by a positive makes a negative
-a-4=-a-4  Subtracting a negative from negative makes a negative
2(-a)-4=-2a-4 Multiplying a negative and a positive makes a negative and subtracting a negative from a negative makes a negative