Business: American Express Operating Revenues The following table shows the operating re...

Business: American Express Operating Revenues The following table shows the operating revenues (in billions of dollars) for American Express.

a. Number the data columns with x-values 1–4 (so that x stands for years since 2008), use power regression to fit a power curve to the data, and state the regression formula. [Hint: See Example 7.]

b. Use the regression formula to predict American Express operating revenues in the year 2020.