$4)$ Let H$($s$)=3($s$+2)/($s$+10)$ for the questions below:

$$a$)(0\mathrm{.}4$pt$)$ What are the poles and zeros of H$($s$)?\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

$$b$)(0\mathrm{.}3$pt$)$ What is the system output when the input is x$($t$)=7?\_\_\_\_\_\_\_\_$

$$c$)(0\mathrm{.}5$pt$)$ What is the system output when the input is x$($t$)=6$ cos$(20$t $+$ $/3)?$