The graph of $f$ is shown. Evaluate each integral by interpreting it in terms of areas.

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$($a$){\displaystyle \underset{0}{\overset{16}{}}}f(x)dx$

$($b$){\displaystyle \underset{0}{\overset{40}{}}}f(x)dx$

$($c$){\displaystyle \underset{40}{\overset{56}{}}}f(x)dx$

$($d$){\displaystyle \underset{0}{\overset{72}{}}}f(x)dx$