What is a variable: Khan Academy
https://www.khanacademy.org/math/algebra-basics/core-algebra-expressions/core-algebra-variables-and-expressions/v/what-is-a-variable
Lesson: Variable Expression
http://www.mathgoodies.com/lessons/vol7/expressions.html
Excellent Video that explains the lesson
https://www.youtube.com/watch?v=fdzrf_EZrM8
Wednesday, January 13, 2016
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