In math, a function is a special relationship where each input has exactly one output. Think of it like a vending machine: when you press a button (input), you only get one specific snack (output).
Now, looking at the table you provided, we can see that each day of the week (the input) has a specific number of children in the car (the output). For example, on Sunday, there are 2 children, and on Monday, there are 4. No day has two different numbers of children; each day corresponds to just one number. This means the table shows a function because every day (input) leads to only one result (output).