A river basin is the geographic area drained by a river and its tributaries. The Mississip...

A river basin is the geographic area drained by a river and its tributaries. The Mississippi River Basin is the third largest in the world and is divided into six sub-basins, whose areas are shown in the following bar graph. Use this graph for Exercise.

How much more square feet of land is drained by the Upper Mississippi sub-basin than the Lower Mississippi sub-basin?