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Enrique uses a gift card to buy coffee at a coffee shop. The initial value of the gift card is $20. The function n=20-2.75c represents the amount of money still left on the gift card n after c cups of coffee are bought. Find the zero of this function. Describe what this means in context

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Answer:

In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. The set X is called the domain of the function and the set Y is called the codomain of the function. Functions were originally the idealization of how a varying quantity depends on another quantity.

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