Need to know how to solve a system of algebraic equations? 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 and solve systems of linear equations in intermediate algebra.
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How To: Calculate percent composition for chemistry

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How To: Simplify Square and Cube Roots

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Find the volume of a sphere with radius r

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area & perimeter of triangles & squares

How To: Find extra points for a parabola (quadractic equation)

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