See how to apply exponent rules to simplify radicals or square roots with this free video math lesson from Internet pedagogical superstar Simon Khan. Looking for a primer on how to solve matrix problems using a TI89 graphing calculator? See how it's done with this free video algebra lesson. From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test).
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How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Convert between diameter and radius

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Find a number given Its percent

How To: Find the Height of a Trapezoid.

How To: Remember "greater than" & "less than" symbols

How To: Find the Percent Given Two Numbers

How To: Solve equations with the order of operations

How To: Calculate percent composition for chemistry

How To: Solve for the missing ratios or proportions

How To: Write a sum/difference of logarithms as a logarithm

How To: Find the Radius of a Circle from Arc Length

How To: Write a logarithm as a sum or difference of logarithms

How To: Find the area of irregular shapes

How To: Find least common multiple in rational expressions

How To: Find a slope of a line parallel/perpendicular to it

How To: Find the slope of a line given 2 points

How To: Graph a circle

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