**Reading:**Chapter 4

**Exercises:**4.3, 4.4, 4.7, 4.9, 4.10, 4.12 and 4.27.

- For 4.3, only find the general solution. You do not need to find the constants c1 and c2 for the given initial conditions.
- For 4,7, also:
- how does the solution change if m is slightly increased?
- how does the solution change if k is slightly increased?
- how does the solution change if b is slightly increased?