# Homework Hints 11-4

### 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
Be sure to distinguish between the lower case s and the upper case S. The lower case is used for terms of the sequence, and the upper case is used for the partial sums. See Example 1.
Problems 11-18
These problems are checking to see if you understand the summation notation; see Example 2.
Problems 19-24
Note that each of these ends with three dots; this means they are infinite geometric series, so be sure to use the correct formula; see Example 6.
Problems 25-44
Are these sums of the terms of arithmetic or geometric sequences? See Examples 3 and 5.
Problems 45-46
See the discussion in the text associated with the Peanuts cartoon in this section.
Problems 47-48
Are these arithmetic or geometric series? See Examples 3 and 5.
Problems 49-50
See Example 6.
Problems 51-54
Consider the sum of an infinite geometric series; see Example 6.