solve and show work using Norton Theorem and Load Conversions

PROBLEM 1. Calculate the Norton equivalent of this circuit as seen by the load resistance RL. (Consider V1 = 18 V, R1 = 6 0, R2 = 3 02, R3 = 4 02.) R1 R3 RL R2 V1 PROBLEM 2. Given V1 = 20 V, V2 = 18 V, R1 = 6 0, R2 = 3 0, calculate the Norton equivalent of this circuit as seen by the load resistance RL. RL V1 R1 V2 R2 MA PROBLEM 3. Covert this Delta network to a Y network. X 100 500 1k PROBLEM 4. Convert this Y network into a Delta network. 10k