Theresa ran on a treadmill for thirty minutes, and her time and speed are shown on the graph above. The x-axis represents time (in minutes), and the y-axis represents speed (in miles per hour).
In the context of Theresa's run, what does the slope of a segment on the graph represent?
The total distance Theresa ran during that segment.
The change in Theresa's speed over time, or her acceleration/deceleration.
Theresa's average speed during the entire run.
The total time Theresa spent running at a particular speed.
