# The sales of a company (in million dollars) for each year are shown

The sales of a company (in million dollars) for each year are shown in the table below.

X(year)

2005

2006

2007

2008

2009

Y(sales)

12

19

29

37

45

a) Find the least square regression line y = ax + b.

b) Use the least squares regression line as a model to estimate the sales of the company in 2012.