What am I supposed to put for the n_OA to get F_OA?

1) Express F as a vector in terms of the unit vectors i, j, and k. Determine the projection, both as a scalar and as a vector, of F onto line Of, which lies in the x-y plane. F2 = Scos 400 = 3. 83 F = 5 kN 400 Fxy = Scos 50" : 3.21 O 30 35 Fx = - 3. 21 5in 350 =- 1.84 Fy = 3, 2/ cos 3 5 . = 2.63 F = - 1,847 + 2.637 + 3.83 k kN FOA = F . NOA