Birth Rate In 1990 the number of births per 1000 people in the United States was 16.7 and decreasing, on average, at 0.136 birth per 1000 people the year. (Source: National Center for Health Statistics.)
(a) Write a formula for a linear function f that models the birth rate x years after 1990.
(b) Estimate the birth rate in 2012 and compare this estimate to the actual value of 13.7.
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