2. Calculate the following operations using two's complement method: (assuming 4-bit register is used) (l point) 6-7 (1 point) -2-7 a. b. 3. What is the binary representation of the following hexadecimal numbers? a. 1 point) 1243E9C4 b. (1 point) 76EADB2F 4. What is the 16-bit hexadecimal representation of each of the following signed decimal integers? (l point) -25 (1 point) -35 a. b. 5. What is the decimal representation of each of the following signed binary numbers? a. (1 point) 10110111 b. (I point) 11001010 c. (1 point) 01110000