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 Functions in the real world :                                                                            Some examples of functions include:                                                                                                                                                                                                  < Money as a function of time. You never have more than one amount of money at any time because you can always add everything to give one total amount. By understanding how your money changes over time, you can plan to spend your money sensibly. Businesses find it very useful to plot the graph of their money over time so that they can see when they are spending too much.                                                                                                                            
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