A built-up beam has a cross section comprised of two C10x25 American Standard channels and a 1/2" x 14" steel plate. The distance from the bottom of the cross section to the centroidal X-axis is 6".
A) 6.75 inches, 7.25 inches, 8 inches, 8.5 inches
B) 6 inches, 6.5 inches, 7 inches, 7.5 inches
C) 7.5 inches, 8 inches, 8.5 inches, 9 inches
D) 7 inches, 7.5 inches, 8 inches, 8.5 inches
