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 find answers to quadratic function problems in intermediate algebra by graphing.
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How To: Find the Height of a Trapezoid.

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

How To: Calculate the area of a parallelogram

How To: Solve rational equations easily

How To: Do long division without a calculator

How To: Find a number given Its percent

How To: Convert between diameter and radius

How To: Calculate standard deviation

How To: Be a human calculator

How To: Cancel out in basic algebra

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

How To: Rationalize square roots

How To: Calculate Faster Than a Calculator

How To: Use ">" (greater than) and "<" (less than) symbols

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

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Prove Rank(A) = Rank(transpose of A) in linear algebra

How To: Figure out the domain & range of a piecewise function

How To: Calculate square roots on paper the easy way
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