**Intro to Logarithms (article) | Logarithms | Khan Academy**
https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:logs/x2ec2f6f830c9fb89:log-intro/a/intro-to-logarithms

WEBA scientific calculator generally always has an ln (natural logarithm, or log base e) key. From the change of base theorem, log base a of b = (ln b)/(ln a). For …

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