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 work with inequalities in introductory algebra.
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How To: Find the area of irregular shapes

How To: Use the Fundamental Rule of Proportions in Algebra

How To: Calculate Faster Than a Calculator

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Use the quadratic equation: finding the mirror point

How To: Find the equations of parallel and perpendicular lines

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