Answer :

Answer:

F. 20

Explanation:

The constant rate of change for the graph can be calculate as the division of the number of students by the number of buses.

So, if the lines passes by a point (1, 20), 1 is the number of buses and 20 is the number of students. Then, the constant rate of change is:

20/1 = 20

So, the answer is:

F. 20

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