Radio Stations The function ƒ gives the number y in thousands of radio stations on the air during year x:
ƒ = {(1950, 2.8), (1975, 7.7), (1990, 10.8), (2000, 12.8), (2005, 13.5)}
(Source: M. Street Corporation.)
(a) Use a mapping diagram (see FIGURE 19) to represent ƒ.
(b) Evaluate and explain what it means.
(c) Identify the domain and range of ƒ.
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