Life expectancy in the United States has increased steadily since 1960. For men, life expectancy can be modeled by y = 0.203x + 65.92, where x is the birth year measured in years after 1960. For instance, a man born in 1960 (x = 0) had a life expectancy of 65.92 years.
a. Predict the life expectancy of a man born in 1990.
b. What is the slope of the equation? Interpret the slope with regard to birth year and life expectancy.
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