Math A.Tube.com
Math ATube.com
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Glossary
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Function?
What is a Function?:  A function is like a machine: it has an input and an output.

And the output is related somehow to the input. But a function doesn't really have belts
or cogs or any moving parts - and it doesn't actually destroy what you put into it!
You put a number into the
machine, and it dumps
another number out. What
did the machine do to your
number