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What type of expression is used to combine terms that have the same variable?

  1. Function

  2. Polynomial

  3. Inequality

  4. Equation

The correct answer is: Polynomial

A function is a set of mathematical rules that relates an input (domain) to an output (range), which is not the type of expression used to combine terms with the same variable. An inequality is a mathematical sentence that compares two expressions, which also does not describe the type of expression used to combine terms with the same variable. An equation is a mathematical statement that shows that two expressions are equal, but it is not used to combine terms with the same variable. Therefore, the correct answer is B Polynomial, as a polynomial expression is used to combine terms with the same variable through the use of addition, subtraction, and multiplication.