please help me with the homework I want to ensure my answer is right

Question 1 Using 4-value logic (0, 1, X, Z, find A, B, C, D, E, F, G, and H (no connection) Question 2 See the next Boolean Function of F that are realized with 3-level circuit F(A, B, C, D)- (A + B)(B'C' + BD') A. Get the static 1-hazards in this circuit. B. Change the design of the circuit as a three-level NOR circuit that is free of all hazards C. Draw the modified circuit Question 3 Realize a full-subtractor using inverted output 3-8 decoder and A. Two NAND gates. Draw B. Two AND gates. Draw Question 4 A circuit has four inputs RSTU and four outputs VWYZ. RSTU represents a binary coded- decimal digit. VW represents the quotient and YZ the remainder when RSTU is divided by 3 (VW and YZ represent 2-bit binary numbers). Assume that invalid inputs do not occur. Realize the circuit using: A. A ROM B. A minimum two-level NAND-gate circuit C. APLA (specify the PLA table)