For this question to work properly, you must enable JavaScript, or use another browser (or computer) on which JavaScript works. WeBWorK Standalone Renderer
  The figure shows an interactive graph of . (It may take a minute to load -- be patient.) You can change the value of in the graph by clicking and dragging the red dot along the horizontal -axis. Assume that the lines in each piece of continue beyond the graphing window. Define a function that accumulates signed area between the -axis and the graph of by

(a) For what values of does ?

(b) For what values of is ?
All in the interval

(c) For what values of does ?

(d) Why is positive when is negative?

Graph of

You can earn partial credit on this problem.