The gure shows a composite slab with dimensions d $=11\mathrm{.}0$ cm$,$ d $=3\mathrm{.}63$ cm$,$ and d $=13\mathrm{.}0$ cm$.$ Half the slab consists of aluminum $($density $=2\mathrm{.}70$ g$/$cm $)$ and half consists of iron $($density $=7\mathrm{.}85$ g$/$cm $).$ What are $($a$)$ the x coordinate, $($b$)$ the y coordinate, and $($c$)$ the z coordinate of the slab's center of mass?