onsider the following systems.

$$ Determine the stability.

$$ Determine the causality. If the system is not causal, find the non$-$causal term in

the impulse response h$[$n$].$ Hint: long division and get terms z$,$ z$2,$ z$3....$

$($a$)$ H$($z$)=3($z$+0\mathrm{.}8)$

z$($z$0\mathrm{.}8)($z$2)$

$($b$)$ H$($z$)=3($z$1)2$

z$31\mathrm{.}6$z$2+0\mathrm{.}64$z

$($c$)$ H$($z$)=$ z$3+$z$2+1$

$($z$1)($z$2)$