$6.$ Problem $9-2$

Find the Laplace transform of the following signals and locate the poles and zeros of F$($s$).$

$($a$)$ f$($t$)=-10$d$($t$)/$dt $($b$)$ f$($t$)=120$cos$(377$t$)$u$($t$)($c$)$ f$($t$)=10[1-$e$^(-500$t$)]$u$($t$)$