represent the following decimal numbers in binary using $8-$bit signed$-$magnitude, $8-$bit one$$s complement and $8-$bit two$$s complement.

$5.77$

$6.-42$

$7.$ Add the following unsigned binary numbers:

$01110101$

$+00111011$

$8.$ Subtract the following signed binary numbers as shown using $2$s complement $($recall computers do not subtract$)$

$01110101$

$-00111011$