**Optional**problems are

*optional*; you can do them to learn more, solutions to them will be posted along with the solutions to the regular problems and some of them will be graded, but these grades will not be used in computing the "homework part" of your grade in the class.

**HW #7, due Thursday, May 13: x2.32, x2.33, x2.34, x2.39, x2.42.**

**HW #6**, due Thursday, May 6: x2.21 (Parts 1, 4 and 5), x2.27, x2.28, x2.30, x2.31.**Optional**: x2.29. Solutions**HW #5**, due Thursday, April 29: x2.8, x2.14, x2.15, x2.17, x2.22, x2.25.**Optional**: x2.23. Solutions**HW #4**, due Thursday, April 22: x2.2, x2.3, x2.5, x2.6, x2.16.**Optional**: x2.18. Solutions**HW #3**, due Thursday, April 15: x1.6, x1.15, x1.17, x1.19, x1.22, x1.24, x1.27. Solutions**HW #2**, due Thursday, April 8: x1.8, x1.10, x1.11, x1.14, x1.18, x1.20, x1.21, x1.23.**Optional**. x1.7, x1.25. Solutions**HW #1**, due Thursday, April 1:**Optional**: x1.2, x1.3, x1.4, x1.5. Solutions