Algebra 1

The trendline is on the graph, and the equation is $y=5.4333x-10558$ The estimated attendance is 335.766 million people.
The graph was made in Microsoft Excel. $y=5.4333*x-10558$ $y=5.4333*2005 - 10558$ $y=10893.766 - 10558$ $y = 335.766$