Suppose we have $-{321}_{10}.$

$1\mathrm{.}1.(5$ points$)$ Express the base$-10$ number into a base$-2$ number. $($Here$,$ base$-2$

number means the number using $1\text{'}$s and $0\text{'}$s still with using $\text{'}-\text{'}$ sign.$)$

$1\mathrm{.}2.(5$ points$)$ Express the base$-2$ number into a binary value by using $16-$bit $2\text{'}$s

complement format. $($Here$,$ the binary number means the number using only $1\text{'}$s

and $0\text{'}$s without using $\text{'}-\text{'}$ sign.$)$

$1\mathrm{.}3.(5$ points$)$ Express the binary value into a hexadecimal number, i$.$e$.,$ base$-16.$