Question $2[10]$

Perform the following operations in a $4-$bit Base$-2$ system.

represent negatives in signed $2\text{'}$s complement form

indicate any overflows, carry, or other issues encountered

$($a$)2+5=7$

$($b$)-8+(16)=8$

$($c$)11+7=18$

$($d$)13-5=8$

$($e$)$ In BCD Show $06+09=15$