The graph below shows values (in billions of dollars per year) of the US deficit, which gives the rate that the US debt accumulates. Use rectangles of width 2 years to estimate the total amount of debt accumulated from mid-2009 to mid-2019. A) Use the left-hand endpoint of each interval. B) Use the right-handprint of each interval. C) Use the midpoint of each interval.

1600 + 1410 1400 + 1300 1200 1290 1080 980 1000 Deficit (billions of dollars per year) 800 670 680 580 780 600 440 400 + 480 200 2009 2011 2013 2015 2017 2019 Year