Answer
a. $g(3)=12$
b. $g(-20)=12$
c. Domain:- $(-\infty,\infty)$. Range:- $\{12\}$.
Work Step by Step
The given function is
$g(x)=12$
a.
Substitute $x=3$ into the function.
$\Rightarrow g(3)=12$.
b.
Substitute $x=-20$ into the function.
$\Rightarrow g(-20)=12$.
c.
This is a linear function with one variable.
Hence, all real number inputs will result in single number $12$ as output.
The domain is $(-\infty,\infty)$.
and the range is $\{12\}$.
