1.3 Introduction to Functions » Video 1 (7:55) Download Video Subtitles & Transcripts
Here are links to a few other videos introducing the idea of a function:
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A description of functions by Bart Snapp. Uses the relationship between cat-years and human-years as the main example.
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What is a function? by Jim Fowler. This video is part of his MOOC on Calculus from The Ohio State University.