For x$[$n$]=(0,5)^($n$)$u$[$n$],$ Find y$[$n$]$ of the following Y$[$z$]$

$($a$)$ Y$($z$)=$x$($z$^(-1))$

$($b$)$ Y$($z$)=$x$(-$z$)$

$($c$)$ Y$($z$)=($zx$($z$))/($z$-1)$

$($d$)$ Y$($z$)=$x$^(2)($z$)$