From: Jeanne 
To: Teacher2Teacher Public Discussion
Date: 2002051411:10:43
Subject: Re: Who uses functions almost everyday?

Hello,

Let's go back to what functions are.  In very casual terms a function
is a rule which connects an element of one set (input) with exactly
one element of another set (output).  There are many instances in
everyday life where people experience functions.

Some examples: 

put money in a vending machine, make a selection --->  the machine
give you your candy/soft drink.

turn the key in your car's ignition --->  your car starts

blow air on a lit candle --->  the flame goes out

A ninth grade student may not see f(x) = f(y) in his/her everyday
life.
However, he/she does experience functions anytime he/she makes use
of "cause and effect" toys/machines/tools.

Just some thoughts...

 -Jeanne, for the T2T service

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