Suppose that in 1986, women's life expectancy was 78.34 years, and in 1983 women's life expectancy was 77.92 years. Likewise, men's life expectancy in 1986 was 71.58 years, and in 1983 men's life expectancy was 70.89 years.

A.) What is the equation for the life expectancy of women? Be sure to include all relevant decimal places of accuracy:

B.) What is the equation for the life expectancy of men? Be sure to include all relevant decimal places of accuracy:

C.) How many years after 1980 do these models predict that the life expectancies of men and women to be the same?

D.) Use your rounded answer in part (C) to find the age at which the life expectancies will be the same.

I feel silly about having to ask, but this is throwing me for a loop.