Chapter 3
Exercise 34:
Hint:
Ground bottom node, kill each source independently and solve for voltage at top node in resulting simple circuit. Notice that the resulting circuit is identical for both circuits to be superposed. Also, please note how easy the question can be solved using nodal analysis [do as a check!]

Ans:
4 V

Exercise S3.1e:
Hint:
Solve for I_x in each of the two circuits below and then sum.

Ans:
3 A

Exercise S3.2e:
Hint:
Solve for V _x in each of the three circuits below and then sum.

Ans:
30 V