I need help with this one. Thank you.
Extracted text: AW 14 x 68 having the following properties: Prop. of W 14 x 68 d = 356.62 mm bf = 254.89 mm Zx = 1885 x 10° mm tf = 18.29 mm Fy = 345 MPa Sx = 1688 x 10° mm Cb = 1.14 Lp = 2.65 m %3D E = 200000 MPa Lr= 8.05 m Elastic buckling stress: For = 420 MPa A) Which of the ff. most nearly gives the flexural strength of the beam if the beam has an unbraced length of 12 m. * 709 486 450 585 638 B) Which of the ff. most nearly gives the flexural strength of the beam if the beam has an unbraced length of 6 m. * 709 486 450 585 638