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Answer:
B. In 3 seconds, the space station travels 15 miles
Explanation:
The x-axis is labeled "Time (seconds)", so an x-coordinate of 3 will correspond to a time of 3 seconds.
At that x-coordinate, the graph has a y-value of 15 (miles). This tells you ...
In 3 seconds, the space station travels 15 miles
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Additional comment
The graph is not a graph of speed, as the title suggests. Rather, it is a graph of position versus time. The slope of the graph is speed.