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 study for that next big test). With this twopart installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to simplify rational expressions in algebra.
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How To: Find the slope of a line given 2 points with fractions

How To: Isolate a variable

How To: Figure out the domain & range of a piecewise function

How To: Calculate Faster Than a Calculator

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

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How To: Find the area of a parallelogram using geometry

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How To: Find the lowest common multiple/LCM with a factor tree

How To: Find the standard deviation with the ZScore formula

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