$(5$ points total$)$ What decimal value does the $8-$bit binary number ${10011110}_2$ have if:

$($a$)(1$ point$)$ it is interpreted as an unsigned number?

$($b$)(1$ point$)$ it is interpreted using sign$-$magnitude representation?

$($c$)(1$ point$)$ it is interpreted using one's complement representation?

$($d$)(1$ point$)$ it is interpreted using two's complement representation?

$($e$)(1$ point$)$ it is interpreted using excess$-127$ representation?