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

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

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Convert between diameter and radius

How To: Learn Calculus in 20 minutes

How To: Use the ratio formula to find coordinates of a point

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How To: Use an asymptote to find the equation of a hyperbola

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How To: Isolate a variable

How To: Convert fractions to percents in two steps

How To: Do normal probability calculations on a calculator

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How To: Solve direct proportions
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