Solve each problem.
Birthrate In 1998, the number of births per 1000 people in the United States was 14.6 and was decreasing at 0.16 birth per 1000 people each year. (Source: U.S. Census Bureau.)
(a) Write a formula for a linear function f that models the birthrate in year x, where x = 0 corresponds to 1998, x = 1 to 1999, and so on.
(b) Estimate the birthrate in 2001, and compare it with the actual value of 14.1.
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