3/13/09
MATH
Today in math class I learned how to evaluate expressions.
A variable is when a letter represents a number that can vary.
A constant is a number that cannot change.
The difference between a variable and a constant is that a variable can change and a constant cannot.
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Expressions
12x = 12•x 4/y = 4÷y 3xy/2 = 3xy÷2
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