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Logarithms, explained - Steve Kelly

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What are logarithms and why are they useful? Get the basics on these critical mathematical functions -- and discover why smart use of logarithms can determine whether your eyes turn red at the swimming pool this summer. Lesson by Steve Kelly, animation by TED-Ed.


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Additional Resources for you to Explore
Read about the history of logarithms.
http://www.sosmath.com/algebra/logs/log1/log1.html
See the Kahn Academy explain logarithms.
http://www.khanacademy.org/math/algebra/logarithms/v/introduction-to-logarithms
Think you got it? Test yourself here! Don't worry, there's no grade. This is just for fun. http://www.regentsprep.org/Regents/math/algtrig/ATE9/LogPrac.htm
Lastly, you can see just how well you know logarithmic equations. Check out this nifty interactive worksheet. http://www.themathpage.com/alg/logarithms.htm
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