The graph of y=−f(x) is the graph of the equation y=−(2x+1), or y=−2x−1. This should be the graph of a decreasing exponential function. The y-intercept of the graph can be found by substituting the value x = 0 into the equation, as follows: y=−20−1=−1−1=−2. Therefore, the graph should pass through the point (0,−2). Choice C is the only function that passes through this point. Choices A and B are incorrect because the graphed functions are increasing instead of decreasing. Choice D is incorrect because the function passes through the point (0,−1)insteadof (0,−2).