Question

Find an integer $\text{'}a\text{'}$ such that (iii) $-4+a=0$

Answer 1

The sum of any integer with its additive inverse is always $0$.

The additive inverse of any integer is the integer with same numerical value and opposite sign.

$$\begin{gathered} -4+a=0 \\ a=+4 \end{gathered}$$

Hence, the value of $\text{'}a\text{'}$ is $4$