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Unhealthy Air Quality The Environmental Protection Agency (EPA) monitors air quality in U.S. cities.
The function f gives the annual number of days with unhealthy air quality in Los Angeles, California, for
selected years.
x 1995 1997 1999 2000 2003
F(x) 113 60 56 87 88
(a) Find f(1995) and interpret your result.
(b) Identify the domain and range of f.
(c) Discuss the trend of air pollution in Los Angeles.

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The solution analyzes air quality.

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a) f(1995) = 113.

b) domain = {1995, 1997, 1999, 2000, 2003}, range = {113, 60, 56, 87, ...

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