During a storm, the level of a river rose to a height of 40 inches above normal. The graph below models the river's height above normal in the
hours after the storm.
River's Height Above Normal
50
40
30
Height (in.)
20
10
0
1 2 3 4 5 6 7 8 9 10
Time (h)
What point on the graph represents the river's height as soon as the storm
ended?