$10-27.$ Determine the distance $\frac{?}{\text{b}\text{a}\text{r}}(y)$ to the centroid of the beam's cross$-$sectional area; then, find the moment of inertia about the $x^{\text{'}}$ axis.

$*10-28.$ Determine the moment of inertia of the beam's cross$-$sectional area about the $x$ axis.

$-10-29.$ Determine the moment of inertia of the beam's cross$-$sectional area about the $y$ axis.