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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 100, start superscript, start text, t, h, end text, end superscript kilometer and the 400, start superscript, start text, t, h, end text, end superscript 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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