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What is a variable in mathematical expressions?

  1. A comparison of two numbers

  2. A number being multiplied to a variable

  3. A symbol used to represent a variable quantity

  4. The initial point of an angle

The correct answer is: A symbol used to represent a variable quantity

A variable in mathematical expressions is a symbol that is used to represent a quantity that can change or vary. It is not a comparison of two numbers, a number being multiplied to a variable, or the initial point of an angle. Variables are placeholders for unknown or changing values in equations and expressions. Therefore, the correct answer is C: A symbol used to represent a variable quantity.