There are lots of problems this week. Some of them are routine. A few require real thought. Those are the interesting ones!

1. Common Sense Exercise 3.8.1. Do not turn this in. But if any of these problems gives you trouble, get some tutoring help right away.

2. Common Sense Exercise 3.8.4. Use the 1+ trick. If you have another personal favorite way to do this problem, do it that way too and check that the answers are the same.

3. Common Sense Exercise 3.8.5. Use the 1+ trick. If you have another personal favorite way to do this problem, do it that way too and check that the answers are the same.

4. Common Sense Exercise 3.8.9.

5. Common Sense Exercise 3.8.10. Think carefully about this one. Use the hint if you need to.

6. Common Sense Exercise 3.8.11.

7. Common Sense Exercise 3.8.16.

8. Common Sense Exercise 3.8.25.

9. Common Sense Exercise 3.8.33.

10. Common Sense Exercise 3.8.40.

11. Common Sense Exercise 3.8.50.