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wegnerkolmp2741o

C is a function.  The must pass the vertical (up and down) line test.  Put a vertical line on it.  It it touches 2 points it is not a function.

ajlee2003

A B and D are not functions because when you draw a vertical line (Vertical line test) the line passes through 2 points of the graph where as in C, it is a function because when you draw a vertical line through the graph, the line only hits 1 point

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