Chapter 1 - Section 1.6 - Subtraction of Real Numbers - Exercise Set - Page 70: 2

$ a.\quad$the additive inverse of $10$ is $-10$ $b.\quad 4-10=4+(-10)$

a. the additive inverse of $10$ is $-10.$ b. To subtract $b$ from $a,\ \mathrm{a}\mathrm{d}\mathrm{d}$ the opposite, or additive inverse, of $b$ to $a.$ $a-b=a+(-b)$ $4-10=4+(-10)$ $=-6$