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Im pretty sure this is right.
Hole? It depends how big it is. Since there is no hole being depicted in this question, the answer is inexcusably 2ft
Answer: The .30 per mile is the independent, because it is manipulated, and changed throughout. DRY MIX : Dependent, Responding, Y axis. Manipulated, Independent, X axis.
You just have to go back from 6, 8 lines. You do this because anything plus a negative number is just subtracting. Hope I helped!