Khan Academy: Logarithm Basics: Logarithms

An introduction to logarithms

Examples of logarithms that evaluate to fractional and negative values.

The second video on Benford's Law from the Khan Academy. This video connects Benford's Law to the logarithmic scale in an effort to explain why it holds true, particularly in data that grows exponentially. [6:27]

Logarithm of a Power

Shows how to solve a logarithmic equation that has a variable in the base. [3:27]

Continuation of video lesson introducing the basic trigonometric ratios. Examples of finding sine, cosine and tangent for two different right triangles, including finding side lengths by the Pythagorean Theorem and rationalizing the...

Video introducing the basic trigonometry ratios sine, cosine, and tangent. Examples are shown for the two acute angles of a right triangle. Includes link to additional practice problems. [9:17]

This video demonstrates how to solve a word problem by calculating rates. The video uses the formula for distance and isolates the variable "r" for rate. Practice problems available. [4:08]

This video follows from Khan Academy: Sequences and Series (Part 1) and furthers the idea of the basic geometric series. Explains how to find the sum of both a finite and an infinite geometric series. Uses limits to find the sum of an...

The basics of the logarithmic Richter and Moment Magnitude Scales to measure earthquakes