To determine the intervals where the function has a positive average rate of change, we need to analyze the function's behavior based on the graph's description you provided:
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The function starts at (0,0) and goes up to (5,5). This means it's increasing over the interval [0, 5], so the average rate of change is positive here.
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The function then goes down from (5,5) to (3,3) during the interval [5, 8]. Since it is decreasing during this interval, the average rate of change is negative.
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Next, the function increases again from (3,3) to (10,15) over the interval [8, 10]. This indicates it is increasing over this interval, hence the average rate of change is positive here as well.
Putting this all together:
- The average rate of change is positive over the intervals [0, 5] and [8, 10].
So, the answer is: The average rate of change is positive over the interval \([0, 5]\) and over the interval \([8, 10]\).