The following table shows the fuel efficiency, in miles per gallon, for all U.S. autos since 1940. Table 2: t (years) y = f(t) 1940 1950 1960 1970 1980 1990 2000 14.8 13.9 13.4 13.5 15.9 20.2 22.0 Find the average rate of change between 1960 and 1980. Select one: O 1.25 mpg/year O-0.125 mpg/year O 0.125 mpg/year O 2.5 mpg/year

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