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| Many buses in Japan determine the fare by means of this electronic board, which displays the price as a function of the distance travelled (the upper fixed number appears on the ticket you receive when boarding, the changing number is the price, changing as you travel). For example, in the above, if you hold a ticket with number 25 and want to get off the bus at the moment the photo was taken, you have to pay 520 yen. If you wait to get off, the electronic board will change according to the distance travelled and you are likely to pay more. A wonderful real world example for a mathematical functions. As the trip procedes, new functions are obtained, so here one has also an example of a family of functions! NEXT |