Question

The graph below shows the distance, y, that a car traveled in x hours:

Answer 1

The answer is 25 mph. I THINK

Answer 2

This is a linear relationship as the rate of change is constant, ie constant velocity.  And the slope represents the velocity, and slope is:

m=(y2-y1)/(x2-x1)

m=(50-25)/(2-1)=25/1

m=25

So the rate of change is 25 mph