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A relation is any set of ordered pairs. All the values that go into a relation are the domain and the range. The domain is the set of all possible inputs or x-values for a function. The range is the set of all possible outputs or y-values for a function. If the domain has an input that is associated with (or results in) more than one output, then the relation between the inputs and the outputs is not a function. When writing the domain or range of a function in interval notation: a closed dot means that the endpoint value is included brackets [] for closed dots an open circle means that the endpoint is not included in the interval an open endpoint with parentheses () Limtations of Domain and Range When a question asks you to find the domain and/or range of a function, remember the various properties and other rules you have learned for numbers and operations. Certain mathematical rules can prevent you from having certain inputs and/or outputs. Practice Problems Answers to Practice Problems C A C B C A
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