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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.

Kelly says that most scientific calculators have a button for only one specific logarithmic function. Are there ways of using your calculator to perform other logarithmic functions? If so, how?

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