Given ${\displaystyle \underset{0}{\overset{5}{}}}f(x)dx=11$ and ${\displaystyle \underset{5}{\overset{7}{}}}f(x)dx=4,$ evaluate the following definite integrals.

$($a$){\displaystyle \underset{0}{\overset{7}{}}}f(x)dx$

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$($b$){\displaystyle \underset{5}{\overset{0}{}}}f(x)dx$

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

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$($d$){\displaystyle \underset{0}{\overset{5}{}}}3f(x)dx$

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