For the built up steel section shown:

a$.$ Find the location of the horizontal centroidal axis and determine its moment of inertia about this axis.

$(overall$ solution $xx$ points$)\frac{}{b}$

$ar(y)=$

$(x$ points $)\frac{?}{b}$

$ar(I{)}_x=-\frac{(x\text{p}\text{o}\text{i}\text{n}\text{t}\text{s})}{(\text{p}\text{o}\text{i}\text{n}\text{t}\text{s}\text{t}\text{o}\text{t}\text{a}\text{l})}$