Business The accompanying graph shows the number of FM commercial radio stations in the Un...

Business The accompanying graph shows the number of FM commercial radio stations in the United States in selected years, along with a linear approximation of the data.*

(a) Use the data points (1980, 3282) and (2000, 5892) to estimate the slope of the line shown. Interpret this number.

---

(b) Use part (a) to approximate the number of stations in 1996.

---

(c) Discuss the accuracy of the linear approximation.

*Statistical Abstract of the United States: 2008.