According to mathematical model, average life expenctancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 year for birth year after 1900. If this trend continues, for which birth year will average life expentancy be 77 years?
a) Write the equation to model problem. Consider t represent number of years after 1900. For instance, t = 12 would represent the year 1912.
b) Solve the equation, then reply question given above.