12) Write -75 decimal as a 16-bit sign-magnitude and a two's complement binary number. 13) If a computer subtracts 0 from 0, is there a carry out of the leftmost position? Hint: No overflow occurs. 14)Does signed overflow occur when any of these pairs of numbers are added. Does unsigned overflow occur? Assume a 4-bit register size. Chapter 1: Numbering Systems 23 0111 1000 1111 0001 1111 1111