**Problems 1-12**

This is a simple code. Write down the alphabet, a comma, and a period, as requested in the directions. Number each of these symbols, and use this “coding key” to answer these questions.

**Problems 13-24**

This is a simple code. Write down the alphabet, a comma, and a period, as requested in the directions. Number each of these symbols, and use this “coding key” to answer these questions.

**Problems 25-36**

Think of the ideas of opposite operations. If the encoding key is to multiply by 5, then the decoding key is to divide by 5. The ideas here are the same ideas you use when solving equations, and need to decide what you need to do to both sides to solve the equation.

**Problems 37-48**

See Example 1.

**Note:** Homework Hints are given only for the Level 1 and Level 2 problems.

However, as you go through the book be sure you look at all the examples in the text. If you need hints for the Level 3 problems, check some sources for help on the internet (see the LINKS for that particular section). As a last resort, you can call the author at (707) 829-0606.

On the other hand, the problems designated “Problem Solving” generally require techniques that do not have textbook examples.

There are many sources for homework help on the internet.

**Algebra.help**

Here is a site where technology meets mathematics. You can search a particular topic or choose lessons, calculators, worksheets for extra practice or other resources.

http://www.algebrahelp.com/

**Quick Math**

This site provides online graphing calculators. This is especially useful if you do not have your own calculator.

http://www.quickmath.com/

**The Math Forum @ Drexel**

This site provides an internet mathematics library that can help if you need extra help. For additional homework help at this site, click one of the links in the right-hand column.

http://mathforum.org/