CISC 401/601 assignment 4.

Each problem is worth 10 points.

1. Exercise 4 on page 78.
2. Exercise 4 on page 84.
3. Exercise 8 on page 85.
4. CISC 401 students, exercise 10, part (a) on page 85.
   CISC 601 students, exercise 10, part (b) on page 85.
5. Exercise 1 on page 87.