19. Represent the following decimal numbers in binary using 8-bit signed magnitude, one's complement two's complement, and excess-127 representations: a) 89 b)-89 22. What decimal value does the 8-bit binary number 10110100 have if a) it is interpreted as an unsigned number? b) it is on a computer using signed-magnitude representation? c) it is on a computer using one's complement representation? d) it is on a computer using two's complement representation? e) it is on a computer using excess-127 representation