Perform the following operations by converting the operands to 2s complement binary numbers and then doing the addition or subtraction shown. Please show all work in binary, operating on 8-bit numbers. Is there an overflow? Please follow the format in the given example: 3 + 12

0000 0011 (3) + 0000 1100 (12) 0000 1111 (15) The decimal value of the result is 15, there is not overflow.

(a) 48 + 85 (b) -45 - 37 (c) -66 - (-56)