Okay, so these are the questions that I need help with. Can someone explain to me what is the difference between signed and unsigned and what to do when converting unsigned/signed? And how do Hexadecimals work?

1) Convert 86 to signed 16 bit binary

2) Convert -123 to signed 16 bit binary

3) Convert 23 to unsigned 16 bit binary

4) Convert 2132 to unsigned hexadecimal

5) Convert 0x4564fabc to an integer

6) Add the signed binary numbers 10101101 and 00101111

7) Add the unsigned binary numbers 10001001 and 00000000

8) Add the two hexadecimal numbers 0x21321abc and 0x00000ffa

9) Subtract the two hexadecimal numbers 0x01321fff and 0x112233ff