The left applet shows
f (t) dt represented as an area. Carefully notice how the
variables
a,
x, and
t relate to each other -- we are using a
t-axis, not an
x-axis!
By selecting "Show Trace" on the right applet, you can see the area graphed as
x (or
a) changes.
Notice that the right applet has an
x-axis. To clear the drawing on the right,
unselect the check box.