Unidentified,$1\mathrm{.}13$ Convert decimal $47$ and $23$ to binary, using the signed $2\text{'}$s complement representation and

enough digits to accommodate the numbers. Then perform the following calculation without

converting to decimal. Then convert the answers back to decimal and verify that they are

correct.

a$)(+23)+(-47)$

b$)(-23)+(+47)$

c$)(-23)+(-47)$