Can someone do these calculations for me? Subject is Computer Organization.

1, Perform the following calculations on 8-bit two's complement numbers:

(a) 00101101 + 01101111

(b) 11111111 + 11111111

(c) 00000000 - 11111111

(d) 11110111 - 11110111

2, Repeat the calculation of the preceding questions but now using one's complement

3, Multiply 0111 and 0011 in binary

Note: you only need to do the 1's or 2's conversion if there is the minus (subtraction) operation involved.