1b: Variables and Expressions. Algebraic Expression : a combination of variables, numbers and at least one operation. Variable : a letter or symbol used to represent an unknown variable. 1b: Variables and Expressions. Examples of Algebraic Expressions.
The letter x is most often used as a variable
Means 7 x d
Means m x n
Evaluate each expression if r = 6 and s = 2.
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