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. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve an absolute value problem in algebra and graph your answer on a number line.
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How To: Solve for the missing ratios or proportions

How To: Find the equation of a line given 1 point

How To: Square expressions involving radicals

How To: Derive the equation of a straight line

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Percent Given Two Numbers

How To: Do long division without a calculator

How To: Find and sketch the domain of a multivariable function

How To: Convert Fahrenheit to Celsius with a formula

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How To: Find the area of a circle when you know the diameter

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