Investing
This activity will use interest calculations as an introduction to exponential functions. Students will investigate the effects of changing the principal and/or interest rates.

Chicago Public Schools
This lesson helps explain the presence of the number e in the continuous interest formula.  See days 80 and 81.

Dow Jones Industrial Average
This page discusses the Dow-Jones average as an exponential function in the base e.

Functions
This is a site that explains many aspects of a function from its definition to an interactive explanation of what it means to be one-to-one.

The Number e
This applet illustrates a special property of the number e.

The number e(2)
This applet illustrates the definition of e.

Slide Rule Explanation
Around the middle of the 20th century, the slide rule was indispensable for every scientist and engineer. Today, to know the principle of a slide rule might be still useful for young people to understand the nature of logarithm.

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