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Fill in Notes for Algebraic Expressions 1. A _____________is a symbol that represents an unknown quantity. 2. An ______________________________ is an expression that contains, variables, numbers and at least one operation. 3. An example of an algebraic expression is: _________ 4. An algebraic expression has to contain at least _______ variable. 5. The branch of mathematics that involves expressions with variables is called ________________. 6. In algebra, the _________________________________ is often omitted. 7. The numerical factor of a multiplication expression that contains a variable is called a _____________.