Be sure you understand the use of function notation by working Exercise.
The U.S. Department of Health and Human Services provides a summary of the number and rate of abortions for the period 1990–2006. Based on these data, the United States abortion rate (number of abortions per 1000 women) can be estimated by the linear function
R(x) = 20.58x + 23.9
where x is the year since 1990 and R(x) is the abortion rate.
(a) Based on this function, is the rate increasing or decreasing?
(b) Find the estimated abortion rate for 2010 and for 2015.
(c) Estimate when the abortion rate will be 8.
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