Evaluating expressions

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Define 'evaluating expressions' in mathematics.

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Evaluating expressions involves substituting values for variables in an expression and performing the necessary arithmetic operations.

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What is a variable in an algebraic expression?

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A variable is a symbol (often a letter) that represents an unknown value in an expression or equation.

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What does it mean to simplify an expression?

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Simplifying an expression means to reduce it to its simplest form by combining like terms and performing arithmetic operations.

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What is the order of operations in mathematics?

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The order of operations is a set of rules that dictates the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right) - often abbreviated as PEMDAS.

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What is a polynomial?

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A polynomial is a mathematical expression that consists of variables, coefficients, and non-negative integer exponents, combined using addition, subtraction, and multiplication.