Step-by-step explanation:
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Answer:
9.8
Step-by-step explanation:

In a simple Cartesian plane, there are two axes, y-axis that is drawn vertically and the x-axis that is drawn horizontally. this problem asks for the an example of horizontal stretch. Thus, the example of horizontal stretch is the stretching of the graph away from the x-axis. Thus, the answer is letter C.
Speed is distance over time
miles per hour is distance over time
so if it averaged 420 miles an hour
is it not 420 miles per hour?
perhaps i am misunderstanding something?