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Real World Example of a Function?

What's an example of a function that you might find in a daily newspaper, and why is it a function? thanks rowlfe, does anyone else know any other real-world examples of a function that you would find in a typical daily newspaper?

Public Comments

1. A function is simply a formula in which you plug in a value and calculate the result. Sales tax, for example, is a function of the price as in f(x)=x+(tax rate)*(x) where tax rate is a decimal fraction. For example, where I live, the rate is 8.5% so the formula becomes f(x)=x+(.085*x).