$(15$ points$)$ The below picture shows the graph of the function $f(x).$ Use this graph to answer the questions below. For each, circle the correct answer.

$($a$){\displaystyle \underset{-1}{\overset{1}{}}}f(x)dx=$

$($b$){\displaystyle \underset{2}{\overset{5}{}}}f(x)dx$ is approximately equal to

$($c$){\displaystyle \underset{-5}{\overset{-1}{}}}f(x)dx$ is

$($d$){\displaystyle \underset{3}{\overset{6}{}}}f(x)dx$ is

$($e$){\displaystyle \underset{4}{\overset{1}{}}}-3f(x)dx$ is