Math Question on the blue book

Inordinate
Thu, 01 May 2008 20:54:31 +0000

i looked in the consolidated thread of answers but this wasn’t on it, surprisingly.

Number 18 on page 400

The shaded region in the figure above is bounded by the x-axis, the line x = 4 and the graph of y=f(x). If the point (a,b) lies in the shaded region, which of the following must be true?

it shows the graph, and asks which choice must be true, i understand why I. is true but i dont seem to understand III too much, despite it being wrong, thanks!