From 1975 to 2009, the age-adjusted incidence rate of invasive lung and bronchial cancer among women can be closely approximated by ƒ(t) = -0.038083t2 + 2.0899t + 24.262, where t is the number of years since 1975. Source: National Cancer Institute. Based on this model, in what year did the incidence rate reach a maximum? On what years was the rate increasing? Decreasing?

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