No matter what amount you pay, you won't get a cheeseburger from a soda machine.
Hence, the domain represents the inputs we can have here, that is, quarters and one-dollar bills. The machine will not give you any flavor of the soda if pennies are input. You can use quarters and one-dollar bills to buy a soda.Domain and range are the main aspects of functions. Similarly, for functions, we input different numbers and we get new numbers as the result. When you put in a certain amount of money, you can select different types of sodas. Functions in mathematics can be compared to the operations of a vending (soda) machine.
