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Teachers' Lounge Discussion: Pre-calculus

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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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