there is no $c-$value such that $f(c)=\frac{1}{2}{\displaystyle \underset{-1}{\overset{1}{}}}f(x)dx.$

$4.($True$/$False$)$ The formula for finding the area between two curves assumes that both curves are positive.

$5.($True$/$False$)$ The area of a circle of radius $r$ is $r^2.$