| Rate of Change | 
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| When one quantity changes in relationship to another quantity, the two quantities are said to have a rate of change. | 
Here we have the following data:
|   | Figure 1. | 
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What is the rate of change from hour 3 to hour 6?
We can use the slope equation to solve this problem:
|   | Figure 2. | 
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From hour 3 to hour 6, the rate of change was 36.66 miles per hour.