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 solve a simple inequality problem.
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How To: Identify characteristics of a sample during a survey

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How To: Increase a number by a percentage in basic arithmetic

How To: Find percent by mass & percent composition

How To: Factor a trinomial with a negative in front

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

How To: Find a missing coordinate given: coordinate & equation

How To: Find the equation of a circle given: center & tangent

How To: Convert Fahrenheit to Celsius with a formula

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