The figure shows a composite slab with dimensions d1 = 11.5 cm, d2 = 2.33 cm, and d3 = 13.7 cm. Half the slab consists of aluminum (density = 2.70 g/cm3) and half consists of iron (density = 7.85 g/cm3). What are (a) the x coordinate, (b) the y coordinate, and (c) the z coordinate of the slab's center of mass?