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 graph and solve a system of linear inequalities in algebra.
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How To: Calculate the area of a triangle using a basic formula

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

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Subtract a mixed number from a proper fraction in basic math

How To: Find the area of a triangle when given 2 sides & angle

How To: Find the coordinate of a point

How To: Find the Radius of a Circle from Arc Length

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