# Homework Hints 7-5

### 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 linksĀ in the right-hand column.
http://mathforum.org/

Problems 1-4
These problems are designed to make sure you are familiar with the Pythagorean theorem as well as the definitions of sine, cosine, and tangent.
Problem 5
Use the Pythagorean theorem and Example 1.
Problems 6-16
Use the definition of the trigonometric ratios.
Problems 17-28
See Example 4; you will need to use a calculator for these problems. Do not forget to round your answer to four decimal places.
Problems 29-37
Use your calculator; see Example 6.
Problems 38-47
Use a calculator; see Example 2.
Problems 48-50
Draw a figure and use the definition of tangent. See Example 5.
Problems 51-52
See Example 7; remember to measure the angle of depression from a horizontal.
Problems 53
Draw a figure. See Example 5.
Problems 54-56
See Example 5; remember to measure the angle of elevation from a horizontal.