I need help to solve attached two problems using Thevenin's Theorem.

Thank you.

 

Problem 1:

Remove RL, replace the voltage source by a short circuit and the current source by an open circuit and calculate the thevenin resistance as seen across terminals a-b.

Problem 2:

Remove Zload, replace the voltage source by a short circuit and the current source by an open circuit and calculate the thevenin impedance as seen across terminals a-b.
To have maximum power transfer, Zload must equal the conjugate of the thevenin impedance.