PSAT Math Multiple-Choice Practice Question 189

Correct Answer: C

Explanation:

C

Difficulty: Medium

Category: Passport to Advanced Math/Functions

Getting to the Answer: A graph is decreasing when the slope is negative; it is increasing when the slope is positive. Eliminate (A) because there are some segments on the graph that have a positive slope. Eliminate (B) because the slope is negative, not positive, between 2009 and 2010. Choice (C) is correct because the slope is negative for each segment between 2004 and 2007 and also between 2009 and 2011.