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 pop. proportion problems in stats.
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How To: Find the formula of a piecewise function given a graph

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How To: Find a missing side of a triangle, similar to another

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

How To: Convert Fahrenheit to Celsius with a formula

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How To: Find a slope of a straight line with: Ax + By + C = 0

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