Postage. The step graph below shows how the cost of a first class U.S. postage stamp

Chapter 3, Problem 3.8.69

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Postage. The step graph below shows how the cost of a first class U.S. postage stamp increased from 1990 through 2010.An open circle at the end of a line segment means the endpoint of the segment is not included. Is this the graph of a function?Postal Rate U.S. First Class Stamp 025303540451990 1995 2000 2005 2010YearPo

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