# What is the limit of f(x)=4 as x approaches 1?

$\setminus {\lim}_{x \to 1} 4 = 4$
Note that the function $f \left(x\right) = 4$ is a straight line where the function is equal to 4 no matter what $x$ is so the limit is 4 no matter where it is.
${\lim}_{x \to a} c = c$