c. Predict the revenue in 2017. d. Predict when the annual revenue will be $10 billion. 72. The percentages of the U.S. federal debt owed to foreigners are shown in Table 31 for various years. Table 31 Percentages of the U.S. Federal Debt Owed to Foreigners Percent Year ? is 11 1985 15 1990 18 1995 22 2000 31 2005 45 2011 47 Source: White House Office of Management and Budget Let P(1) be the percentage of the U.S. federal debt owed to foreigners at 1 years since 1980. A model of the situation is P(t) = 0.0157(1 + 26.1)? - 1.7 a. Use a graphing calculator to draw the graph of the model fand, in the same viewing window, the scattergram of the data. Does the model fit the data well? b. Use P to predict the percentage of the federal debt owed to foreigners in 2018. e. In Exercise 34 of Homework 4.5. you found an equation close to f(0) 222.15(1.085), where () is the federal debt (in billions of dollars) at 7 years since 1960. Use to predict the federal debt in 2018. Then use your result in part (b) to predict the number of billions of dollars of that debt owed to foreigners in 2018. d. Use P to predict when all of the debt will be owed to foreigners. from years zor in For Exercises 73-78, find approximate solutions of the given aqua- tion or system by referring to the graphs shown in Fig. 66. Round results or coordinates of results to the first decimal place. in this