The fuel efficiency (mpg rating) for cars has been increasing steadily since 1980. The formula for a car's average fuel efficiency for a given year between 1980 and 1996 is E = 0.36x + 15.9 where E is miles per gallon and z is the number of years after 1980. Note: Round your answers down to get the corresponding year. For instance, at æ = 3.89, the year is 1983. a. In what years was the average fuel efficiency for cars less than 17 mpg (in interval form)? Preview b. In what years was the average fuel efficiency for cars more than 20 mpg (in interval form)? Preview

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