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 linear, quadratic and exponential models.
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How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

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

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

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

How To: Find the Percent Given Two Numbers

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

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

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

How To: Write a slopeintercept equation given an XY table

How To: Calculate the area of a parallelogram

How To: Find a number given Its percent

How To: Isolate a variable

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

How To: Solve algebraic equations with the y = mx+b format

How To: Solve word problems involving domain and range

How To: Find the Slope Given 2 Ordered Pairs

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

How To: Determine the age of a fossil using carbon14

How To: Write a fraction as a decimal
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