Disposable income is the amount left after taxes have been paid and is one measure of the

Question:

Disposable income is the amount left after taxes have been paid and is one measure of the health of the economy. The following table gives the total U.S disposable income (in billions of 2005 dollars) for selected years from 2010 and projected to 2040.
(a) Use x as the number of years past 2010 and write the equation of the function that is the best fit for these data.
(b) What does the model predict for the disposable income in 2027?
(c) Interpret the slope of the model found in part (a).