P1. (15 pts) Number Systems. a). (5 pts) Convert the following 8-bit two's complement binary number to a decimal number format and a hexadecimal number format: 10110101 b). (10 pts) Consider the following two numbers: A=-19 and B=36. Convert them to signed 7-bit two's complement binary numbers and then do the arithmetic operation A-B. Your results should be in signed 7-bit two's complement format. Indicate whether the arithmetic operation's result overflows or not. Show your intermediate steps in deriving your