$(26)$ The graph of a function $f$ is shown below. Use it to evaluate each of the following integrals by interpreting them in terms of net area.

$($a$){\displaystyle \underset{0}{\overset{1}{}}}f(x)dx$

$($b$){\displaystyle \underset{1}{\overset{5}{}}}f(x)dx$

$($c$){\displaystyle \underset{4}{\overset{2}{}}}f(x)dx$

$($d$){\displaystyle \underset{1}{\overset{4}{}}}(5f(x)-3)dx$