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A function is any rule, on how one amount depends on another amount. To be a "function", for one input value (or set of input values), the output value must be uniquely defined.As for applications in real life, there are many. For example, the total cost of a number of products will depend on the amount you buy; the air pressure depends (to a great extent) on the altitude at which you are located; the area of a parcel depends on its length and on its width; etc.

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Q: What are functions and how do we use them in real life?
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