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Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
The square root function is apparent on almost all calculators that are commercially available. Such calculators can be bought at stores like Best Buy, Staples, and Office Depot.
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.