A variable is a (letter) symbol that represents one or more numbers
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A symbol, usually a letter, that is used to represent 1 or more numbers
Use a variable for the question
A term is a number or the product of a number and variable(s).
a variable expression in math is a symbol that is in a sentence
Frequency is the amount of times a variable appears in a set. For example, if the number three appears 5 times it's frequency is five.