In 1991, the life expectancy of males in a certain country 68.9 years. In 1997, it was 71.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991. The linear function that fits the data is. E(t)= _t + _ ? Round answer to the nearest tenth. Also, use the function to predict the life expectancy of males in 2009.