variable - a letter that is used to represent a number, vary - to change the number used to replace the letter, order of operations - the universal mathematical steps used to evaluate an expression that has multiple operations, evaluate - an instruction that indicates to find the value, exponent - the number that tells how many times the base occurs as a factor, base - the number that is used as a factor in exponential form, exponential form - writing the base and the exponent, expanded form - writing the given expression as repeated multiplication, substitution - replacing the variable in an algebraic expression with a number, algebraic expression - an expression that contains variable, numbers, and may contain operation symbols,

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