Life expectancy in the United States has increased steadily since 1960. For women, life expectancy can be modeled by y = 0.171x + 73.32, where x is the birth year measured in years after 1960.
For instance, a woman born in 1960 (x = 0) had a life expectancy of 73.32 years.
a. Predict the life expectancy of a woman 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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