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 Everyday Examples
 Function:  A rule of matching elements of two sets of numbers in which an input value from the first set has only one output value in the second set.

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Computers use mathematical functions to determine the amount of interest or balance in a bank account. For example, a computer program that determines the amount of interest, i, earned in an account earning at a monthly interest of 0.4% will use the formula i = b(1.004), where b is the average balance of the account over the month.