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Exponential and Logarithmic Functions

1. Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of the function in each case.

2. A cell divides into two identical copies every 4 minutes. How many cells will exist after 3 hours?

http://www.purplemath.com/modules/graphexp.htm

http://www.purplemath.com/modules/expofcns.htm
http://www.purplemath.com/modules/logs.htm

http://www.purplemath.com/modules/graphlog.htm

http://www.purplemath.com/modules/logrules.htm

Spend some time on these sites and go through the information on graphing exponential and logarithmic functions. Summarize your findings in your own words; be sure to include the URL of each web site from which you drew information. In your response include the following points:

General form of the function: exponential and logarithmic
One example each of exponential and logarithmic function
Characteristics of the graphical representation of each function (Minimum four characteristics)

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