With step by step explanation please! :)

1) (25 pts, 5 pts each) A) What is the decimal equivalent of the following unsigned binary number: 100000112 (This number has 9 binary digits) B) what is the hexadecimal equivalent of that number? C) Convert the following hexadecimal number to binary form : FADB D) Find the two's complement representation of the following number assuming the word size is 8 bits:-58 E) Answer D, assuming the word size is 16 bits