13. The total sales of sporting goods in the United States from 1981 through 1992 can be approximated by the model S(t) = 16.8091 + 0.715t2 - 0.0446t3, where the sales are measured in billions of dollars and the time t represents the calendar year, with t = 1 corresponding to 1981. a. State the appropriate domain and range for S(t). Explain your reasoning. b. Find S(9). c. Interpret S(9). d. Solve S(t) = 32.91. e. Interpret S(t) = 32.91. f. This model only gave approximate values, the actual sales for 1990 was 44.1 billion. How much error did this model have for the year 1990