the integral gives the area under the curve, that is, the area between the curve and the x-axis. if the curve is below the x-axis, the integral gives the negative area. with that in mind, you should be able to follow this easily Originally Posted by

**mathaction** You are given the graph below where

*A*1 =

18 and *A*2 = 5. (The graph is not drawn to scale.)
Figure 5.29

Use Figure 5.29 to find the following values.

(a)

=

(b)

=

(c)

=

(d)

=

(the absolute values flips the negative part of the graph up, so now the area for the second part is positive when given by the integral)