Use the graph of the function $y=f(x)$ below to answer the questions.

$($a$)$ Is $f(5)$ positive?

Yes No

$($b$)$ For which value$($s$)$ of $x$ is $f(x)>0?$

Write your answer using interval notation.

$($c$)$ For which value$($s$)$ of $x$ is $f(x)=0?$

If there is more than one value, separate them with commas.