Problem $6[$based on Exercise $5\mathrm{.}36](10$ points$)$

Express the base $10$ numbers below in Q $6\mathrm{.}6$ format $(12-$bit fixed$-$point two's complement format with six integer bits and six fraction bits$).$ Express your final answer in hexadecimal

$($a$)-30\mathrm{.}5$

$($b$)16\mathrm{.}25$