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Answer:
C) 2.5 < x < 5.5
Step-by-step explanation:
"Decreasing" means any point to the right of the one you're looking at has a lower y-value. This is the case for all of the points having x-values more than 2.5 and less than 5.5.
The graph is decreasing on the interval ...
2.5 < x < 5.5
