8) Implement a 2x1 multiplexer (a multiplexer with two line inputs and one select input) using a 3x8 decoder and OR gates. 9) Prepare a ROM table in hexadecimal format for the adder in Question 7) to be implemented in a 16-byte (16x8) ROM. 7) Design a combinational circuit that produces the sum of two 2-bit binary numbers xixo and yiyo. a) Write down the truth table for such a 2-bit adder. b) Simplify the logic functions, which produce the outputs. c) Show the AND-OR implementations of these functions