Please provide solutions for the above problems

4. a) Convert each pair of decimal number to BCD and add i) (65)10+(58)10 ii) (113)10+(101)10 6 b) Convert (2AC5.D)16 to decimal, octal and binary number 6. What is the advantage of 2's complement representation in computers? Perform the following operations using 2's complement method: i) (+55)-(+15) ii) (-55)-(-15) b) Implement the following Boolean expression using NOR only Gates: ((A+B)C)D D d) Implement the following Boolean expression using NAND only Gates: ((A+B)C)D