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The graph of y=f(x) is shown in red below. For how many values of c is f(c) = -1?

 

 

image: https://latex.artofproblemsolving.com/7/4/5/745692871d4963aedcef20352e362e9107ab1ec0.png

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(Assume grid lines are spaced 1 unit apart.)

 Jun 26, 2020
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We're looking for values of x where the y point is -1. Looking at the graph, we draw a horizontal line for y=-1. There are 4 values of f(c)=-1.

 Jun 26, 2020

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