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Average rate of change word problems

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Problem

Wang Yan drove her truck. The fuel remaining in the truck's tank (in liters) as a function of distance (in kilometers) is graphed.
What is the approximate average fuel consumption rate, between the 100th kilometer and the 400th kilometer?
The first quadrant of a coordinate plane. The x-axis scales by one hundred and is labeled Distance in kilometers. The y-axis scales by twenty-five and is labeled Fuel in liters. The graph is a continuous curve. It starts at the y-intercepts zero, five hundred and decreases at a non linear rate through the point one hundred, three hundred seventy-five, the point two hundred, two hundred seventy-five, the point four hundred, one hundred twenty-five, and the point six hundred, twenty-five until it stop at the x-intercept eight hundred, zero.
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