Please answer with simple explanation, will upvote

Question $18$

$10$ pts

Convert the decimal number $-5\mathrm{.}6$ to a floating$-$point number expressed in the $14-$bit simple model given in your text $(1$ bit for the sign, $5$ bits for exponent using excess$-15$ notation, and $8$ bit mantissa with no implied bit$).$

Question $19$

$10$ pts

The binary string $11011111011111$ is a floating$-$point number expressed using the $14-$bit simple model given in your text. What is its decimal equivalent?

Note: in the $14-$bit simple model, the left$-$most bit is the sign bit, followed by $5$ bits for the exponent, followed by $8$ bits for the mantissa $($There are no implied bits$).$ The exponent is in Excess $15$ notation.