Answer:
Problem 8 is No and Problem 9 is Yes
-2/5
Explanation
A additive inverse of a number that when added to that number it is zero
2/5+-2/5=0
So the additive inverse is
-2/5
The first one is the answer because
|6-5|<3 and 1<3
|4-5|<3 and -1<3
|2-5|<3 and -3<3
|0-5|<3 and -5<3
|-2-5|<3 and -7<3
|-4-5|<3 and -9<3
|-6-5|<3 and -11<3