Answer
$ a.\quad$the additive inverse of $-8$ is $8.$
$b.\quad 2-(-8)=2+8$
Work Step by Step
a. the additive inverse of $-8$ is $8.$
b.
To subtract $b$ from $a,\ \mathrm{a}\mathrm{d}\mathrm{d}$ the opposite, or additive inverse, of $b$ to $a.$
$a-b=a+(-b)$
$2-(-8)=2+8$
$=10$
