Homework Hints 15-3

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/

Ask Dr. Math
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 1-2
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. Note that the answer e = 2.718281828 for Problem 2 is NOT correct. The number e cannot be represented as a terminating decimal, so what you see on your calculator is an approximation.
Problems 3-11
First, notice that each of these is a parabola. If the coefficient is positive, the parabola opens up and if it is negative, the parabola opens down.  See Examples 1 and 2.
Problems 12-14
First, notice that each of these is a parabola which opens left or right. If the coefficient is positive, the parabola opens right and if it is negative, the parabola opens left.  See Example 3.
Problems 15-22
First decide if the parabola opens up/down or right/left. Next, graph the curve by plotting points. Look at the numerical coefficients to help you make choices and set scale. See Examples 1-3.
Problems 23-30
Notice that these curves are parabolas and choose values for x to calculate corresponding values for y. See Examples 2 and 3.
Problems 31-42
First, note that each of these is an exponential. Choose appropriate x values to find corresponding y values. See Example 4.
Problems 43-44
Does these look more like Example 2 or Example 3?]/tippy]

Problems 45-50
Set up a table of values.
In Problems 45-48, pick x-values and find the corresponding y-values.
In Problems 49 and 50, pick y-values and find the corresponding x-values.

Problems 51-52
See Example 5.
Problems 53-54
See Example 6.