Please answer Q.no. 7,9,10,11

6. Show how to use only NOR gates to make An OR gate. (double complement: a second NOR gate that joins the inputs...) AND gate: ad one moxre to AND gate at the end: (4 gates) 7. Implement a 2:4 decoder with AND, OR, and NOT gates. 8. Write a Boolean equation in sum-of-products canonical form for the truth table 9. Simplify the followin Boolean equations using Boolean theorems. Check for correctness using a truth table or K-map 10. Implement the following expression: X (A+B)C+D) a. Using NAND logic (only NAND gates): I1. Apply DeMorgan's theorems to the following expression: X-(AB + C)(AD+BC)+A+B + C