Find the 8-bit 2’s complement representation of each of the following decimal numbers. a. 87 c. -53 b. 0 d. -128 6) the following pairs of numbers a and b are in 2’s complement representation with the left most bit indicating the sign. calculate (a + b), (a – b), (-a + b ), and (-a – b) for each pair using 8-bit 2’s complement binary arithmetic. check your results by decimal arithmetic. explain any unusual results if any. a. 1011010, 0101010 b. 1, 0 c. 11010101, 10111