Evaluating Expressions

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Define 'evaluating an expression' in mathematics.

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Evaluating an expression means calculating its value by substituting variables with their respective numerical values.

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What is the order of operations used in evaluating expressions?

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The order of operations is 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 does it mean to substitute a variable in an expression?

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Substituting a variable means replacing the variable with a specific number to evaluate the expression.

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