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). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve absolute value inequalities in algebra.
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How To: Find the area of an oblique triangle using formulas

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How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the standard deviation with the ZScore formula

How To: Find the formula of a piecewise function given a graph

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