$($a$).$ Write number $-45$ in twos complement using $8-$bit binary code $(3$ points$)$

$($b$).$ Write number $95$ in twos complement using $8-$bit binary code $(3$ points$)$

$($c$).$ Perform subtraction $-45-95$ using twos complement $($show each step$)(3$ points$)$

$($d$).$ Expand$-45$ in $($a$)$ to a $16-$bit binary $(3$ points$)$