Question $3$

$3\mathrm{.}1$ Perform the following arithmetic operations in binary.

$3\mathrm{.}1\mathrm{.}111,4_{8}B,6_{16}($answer in Decimal$)$

$3\mathrm{.}1\mathrm{.}2BE,2_{16}{B}_{16}($answer in Octal$)$

$3\mathrm{.}2$ Do the following addition in signed binary using the $2\text{'}$s complement method.

${31}_8+(-{40}_8)$

$3\mathrm{.}3$ Do the following addition in signed binary using $2\text{'}$s complement.

${72}_{16}-4F_{16}$