Answer
Domain: All real numbers except $-20$ and $10$
Work Step by Step
The table shows that the function is undefined for $x= -20$ and $x= 10$. Hence, the domain is:
$$
\begin{aligned}
\textbf{Domain: }&\text{ All real numbers}&\\
&\textbf{except}\quad x= -20\quad \textbf{and}\ x=10 \\
\end{aligned}
$$ The domain can be wriiten as $$(-\infty,-20)\cup(-20,10)\cup(10,\infty).$$
