**Problems 1-2**

IN YOUR OWN WORDS problems remind you of what you did in the previous section.

**Problems 3-6**

Light “on” represents a “1” and light “off” represents a “0.” See Figure 4.3.

**Problems 7-18**

See Examples 1 and 2. Write each given number in exponential notation.

**Problems 19-30**

See Example 3. Use repeated division and keep track of the remainders.

**Problems 31-34**

See Table 4.9. The letter “D” follows the capital C (which has ASCII code 67), so “D” is 68. Repeat for each letter.

**Problems 35-38**

See Table 4.9. The number “70” is “F,” so “71” is “G,” and “72” is “H.”

**Problems 39-45**

Read the directions to these problems carefully, and then use the addition and multiplication tables to work out an answer, as shown in Example 3.

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

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/