please show work

1. (20 points) Obtain the l's and 2's complements of the following binary numbers: a. 00100000 b. 00000000 d. 10010010 2. (20 points) Convert the following decimal numbers to 8-bit signed 2's complement number representation: a) 39 b) -39 c) 115 d)-90 3. (30 points) Perform subtraction on the given unsigned binary numbers using the 2's complement of the subtrahend. Where the result should be negative, find its 2's complement and affix a minus sign. a. 10010 - 10001 b. 100011 100110 c. 1000- 110101 4. (30 points) Convert decimal +49 and +29 to binary, using the signed-2's-compliment representation and enough digits to accommodate the numbers. Then perform the binary equivalent of (+29)+(-49), (-29)+(+49), and (-29)+(-49). Convert the answers back to decimal and verify that they are correct