Need help adding and subtracting rational expressions in algebra? Grab a pen and hunker down with these practice problems. 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).
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How To: Find a missing side of a triangle, similar to another

How To: Find the area of a parallelogram using geometry

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How To: Find the Slope Given 2 Ordered Pairs

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