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To find the rate of change in the cost of gas as each gallon is pumped, we can use the formula for the slope of a line:
slope = (change in y) / (change in x)
Given the points (4,15) and (8,30), the change in y is 30 - 15 = 15, and the change in x is 8 - 4 = 4.
Plugging these values into the formula, we get:
slope = 15/4
Therefore, the rate of change in the cost of gas as each gallon is pumped is 15/4.