What decimal value does the $8-$bit binary number $10011110$ represent if:

a$)$ Is is interpreted as an unsigned number?

b$)$ It is on a computer using two's complement representation?

$4$ What decimal value does the $8-$bit binary number $10110100$ have if

a$)$ It is interpereted as an unsigned number?

b$)$ It is on a computer using two's complemient representation?