$1)$ the following $8-$bit hexadecimal values are stored in two's complement format. What are the equivalent signed decimal values:

a$)$ ab $(5$ points$)$

b$)7$f $(5$ points$)$

c$)80(5$ points$)$

d$)5$f $(5$ points$)$

$2)$ Show how each of the following signed, decimal integers would be stored in $16-$bit two's complement format. Give your answer in hexadecimal.

a$)-21(5$ points$)$

b$)4096(5$ points$)$

c$)-512(5$ points$)$

d$)1010(5$ points$)$