Google Ad Revenue The table lists the worldwide advertising revenue of Goo...

Google Ad Revenue The table lists the worldwide advertising revenue of Google (in billions of dollars).

(a) Find the point–slope form of the line that passes through the points (2005, 6) and (2011, 37). Let (x1, y1) be (2005, 6).

(b) Interpret the slope of the line.

(c) Use this equation to estimate the revenue in 2007 and 2009. Compare these estimates with the actual values shown in the table.