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 unpack and solve word problems that require you to apply quadratic functions in algebra.
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How To: Find the Percent Given Two Numbers

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How To: Find the formula of a piecewise function given a graph

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How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

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How To: Calculate Faster Than a Calculator

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How To: Find outliers using the Zscore method

How To: Find the area of irregular shapes

How To: Find the Percent Given Two Numbers

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

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

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

How To: Find the formula of a piecewise function given a graph

How To: Do long division without a calculator

How To: Write a slopeintercept equation given an XY table

How To: Find a number given Its percent

How To: Calculate the height and volume of a pyramid

How To: Find and sketch the domain of a multivariable function

How To: Find the slope of a line given 2 points with fractions

How To: Translate a shape

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Calculate percent composition for chemistry

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

How To: Calculate Faster Than a Calculator

How To: Find a missing side of a triangle, similar to another

How To: Learn Calculus in 20 minutes

How To: Find outliers using the Zscore method

How To: Find the area of irregular shapes
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