Sal Khan
An look at exponential and logarithmic functions including many of their properties and graphs. This tutorial shows you what a logarithmic function is. It will then go on to show the many times in nature and science that these type of functions are useful. Source: Khan Academy (www.khanacademy.org), used under the Creative Commons Attribution-NonCommercial-ShareAlike (CC BY-NC-SA) license. All Khan Academy content is available for free at www.khanacademy.org. Khan Academy does not endorse the World Public Library.
Read this work at the World Public Library (library card needed).