<h1>18: (graph included, you probably need to see it to answer it)</h1>
<p>the shaded region in the figure abovei s bounded by the x axis, the line x = 4, and the graph of y = f(x). The point (a,b) lies in the shaded region. which of the following must be true?</p>
<p>I. a < or equal to 4
II. b < or equal to a
III. b < or equal to f(a)</p>
<p>answer: I and III</p>
<p>I understand why I is true and II is false, but I don't understand III. Doesn't f(a) = b? that makes it false... so isn't it only I?</p>