SOLUTION: According to one mathematical model, the average life expectancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 years for each birth year af

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Question 147075This question is from textbook Blitzer Intermediate Algebra
: According to one mathematical model, the average life expectancy for American men born in 1900 was 55 years. Life expectancy has increased by about 0.2 years for each birth year after 1900. If this trend continues, for which birth year will the average life expectancy be 91 years? This question is from textbook Blitzer Intermediate Algebra

Answer by Monarch(4) About Me  (Show Source):
You can put this solution on YOUR website!
In 1900 avg. life expectancy is 55. To make is 91, we need 91-55=36 more years
In 1 year it increases 0.2 years, So to increase 36 years we need
36/0.2 = 180 more years to make life expectancy 91.
So the birth year is 1900 + 180 = 2080 birth year.