In the table below, x represents the miles traveled and y represents the cost to travel by train. Miles, xCost, y28.50515.25822.001231.00What is the slope of this function?

Use the change in cost divided by the change in miles. From (2, 8.50) to (5, 15.25), the slope is (15.25 − 8.50) ÷ (5 − 2) = 6.75 ÷ 3 = 2.25. So the cost increases by $2.25 per mile, which is choice C, 2.25.

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