# Homework Hints 10-3

### 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/

Dr. Math is a registered trademark. This is an excellent site at which you can search to see if your question has been previously asked, or you can send your question directly to Dr. Math to receive an answer.
http://mathforum.org/dr.math/

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/

Problems 1-4
There are many problems throughout the text labeled IN YOUR OWN WORDS. Just relax; do not be afraid to give your opinion. For the most part, these questions do not have “right” or “wrong” answers. You should spend about five minutes in answering each of these questions.
Problems 5-10
Use the decibel formula; see Example 10.
Problems 11-12
Use the growth/decay formula; see Example 3.
Problems 13-16
Use the growth/decay formula; see Example 5.
Problems 17-18
Let M1 and M2 be the two given magnitudes. Work through the steps shown in Example 8.
Problems 19-20
See Example 9.
Problem 21
Use the formula given in the problem, with M = 8.3; solve for E.
Problems 22-23
Use the value for r from Example 5 and then see Example 7.
Problems 24-25
See Example 5.
Problems 26-27
See Example 9.
Problems 28-30
See Example 7.
Problems 31-33
See Example 9.
Problem 34-37
Use the formulas given as part of the problem, identify the variables associated with the given data, and then solve the for requested value.
Problems 38-42
Use the given formula, substitute the values for the given variables, and solve the resulting equations as shown in Example 2.