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In the graph showing the number of daily homework problems assigned for a math class, the horizontal axis shows the number of school days since the beginning of the term and the vertical axis shows the number of daily homework problems.

Which conclusion is correct based on this graph?
The graphed function v(t) represents the number of vehicles, v, stopped at a toll booth t hours after 6:00 a.m. The coordinates of points A and B are (1,49.4) and (4,45.8), respectively.

What is the average rate of change of the number of vehicles from point A to point B?