Khan Academy Static

Wait, why are we using letters in math? How can an 'x' represent a number? What number is it? This tutorial is great if you're just beginning to delve into the world of variables and expressions.

2982_Evaluating_an_expression_with_one_variable.html

2980_What_is_a_variable_.html

2981_Why_aren_t_we_using_the_multiplication_sign_.html