Thevenin's Theorem

I am after someone to write the equations used to find Vab1 using volatage souce and Vab2 using the current source which will in turn give me ETH(Thevin Voltage) for the circuit (Vab1+Vab2) Vab1 is the volatage of the circuit using the voltage source and open circuit current source and applying the voltage divider rule. Vab2 is determined by using ohm's law with current source and shorted voltage source. (See attached file for circuit diagram)

Thevinin Equivalent to work out max power

This is part of a maximum power problem that I have worked through. Could I please get someone to write down the equation for working out the ZTH(Thevinin equivalent load for this circuit) also could you find Vab1 is the volatage of the circuit using the voltage source and open circuit current source and applying the voltage divider rule. Vab2 is determined by using ohm's law with current source and shorted voltage source. (See attached file for circuit diagram)

Superposition Theorem - Independent Sources

Using Superposition theorem for independent sources (ie using ohm's law and applying the current divider rule) I would like to check the equations used to find the voltage accross R4. RL is known so workings do not need to be shown. (See attached file for circuit diagram) This is a check for me as I am studying for an exam, so please show all working so as if I have gone wrong I can see why.

Find the drain Voltage

See attached .Can yo show me how to find the value of R to obtain the drain current Id=.4mA.Also find the drain voltage VD.The NMOS transistor has a Vt=2V (See attached file for full problem description)

bjt transistor

(See attached file for full problem description)