Use 2's complement to perform the following operations in 8 bits. Indicate if there is overflow. a. -77 plus 45 b. -105 plus -77 How is a combinational circuit different from a sequential circuit? How is the D flip flop different from an SR flip flop Describe the output of the D flip flop, given the applied CLK and D inputs shown. At which labelled point, does the output waveform rise? Why