Select all the intervals where f is decreasing

2 answers:

sammy [17]3 years ago

6 0

One Answer: Choice C) 0 < x < 1

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Explanation:

Let's go through the answer choices one at a time.

Choice A represents an increasing interval since the graph goes uphill as we move from left to right. The line through the points (-2, f(-2)) and (-1.5, f(-1.5)) has a positive slope. We can rule out choice A.
Choice B is a similar story to choice A. The graph goes uphill when we move from x = -1 to x = 0, so the graph is increasing on the interval -1 < x < 0. We can rule out choice B.
In contrast, choice C is a decreasing interval. Going from x = 0 to x = 1 has us move downhill. Choice C is the only answer.
Choice D is false because choice C was shown to be true.