Whenever postage rates change, some newspaper publishes a graph like this one, which shows the price of a firstclass stamp from 1982 to 2008:
(a) Let f be the function whose rule is
f(x) = cost of a first−class stamp in year x .
Find f(2000) and f(2011).
(b) Explain why the graph in the figure is not the graph of the function f . What must be done to the figure to make it an accurate graph of the function f ?
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