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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)
Where:
- change in y = difference in cost of gas (y) = 30 - 15 = 15
- change in x = difference in number of gallons pumped (x) = 8 - 4 = 4
slope = 15 / 4 = 3.75
Therefore, the rate of change in the cost of gas as each gallon is pumped is 3.75.