In 1990 the life expecantcy of males in a certain country was 65.9 years. In 1996, it was 69.6 years. Let E r?

In 1990 the life expectancy of males in a certain country was 65.9 years. In 1996, it was 69.6 years. Let E represent the life expectancy in years t and let t represent the number of years since 1990