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In mathematics, a function is a relationship between a set of inputs and a set of possible outputs, where each input is related to exactly one output. In other words, for every input, there is only one output.
Looking at the table provided, the relationship between the days of the week and the number of children in the car shows a function because each day of the week (input) corresponds to a specific number of children in the car (output) and there are no repetitions or multiple outputs for a single input. This means that each day of the week is uniquely mapped to the number of children in the car, fulfilling the definition of a function.