By using Social Security Administration data for selected years from 1950 and projected to 2050, the additional years of life expectancy at age 65 can be described by y = 0.077x + 13.8 where x equals the number of years past 1950.

(a) To what year does x = 70 correspond?

(b) What is the predicted additional years of life expectancy of a 65-year-old in 2050?

(c) In what year does the function predict the life expectancy to be 20 years after age 65?