Sunday, February 12, 2012


Variable- a letter that represents an unknown number.
eg.) x, a, n, tx2= ...

expression- any single number or variable, or combination of operations involving numbers and variables.
eg.) 5, n, 8+, x+, 2y-7

Value- a known or calculated amount.

Constant- a number that doesn't change and it increases or decreases the value of an expression.

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