Average life expectancy increased linearly from 74.7 years for a person born in 1985 to 77.8 years for a person born in 2005.
(a) Find a linear equation that gives the average life expectancy y of a person born in year x, with x = 0 corresponding to 1985.
(b) Use the equation in part (a) to estimate the average life expectancy of a person born in 1990.
(c) Assuming the equation remains valid, in what year will he average life expectancy be 80 years for people born in that year?
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