Problem 1:

Use Source Transformation to find V1 and V2?
Problem 2:

(a) Find the Thevenin equivalent circuit between a and b?
(b) What is the value of the load that when connected between a and b will absorb maximum power?
(c) what is the maximum power for the load in part (b)?
Problem 3:

Find the Norton equivalent between a and b using (Find the short circuit current directly) ?
Problem 4:

Use the principle of superposition to find outV ?