Task $4$ Theory of stability

Given a welded profile consisting of a UNP$100$ profile and a HE$100$B profile, see the figure.

c$)$ Find the center of gravity of the compound cross$-$section about the strong axis $($y$)$ and weak axis $($z$)!$

d$)$ Find the area moment $($moment of inertia$)$ for strong axis $($y$)$ and weak axis $($z$)$ if

centroidal axes of the compound cross$-$section!