I. MULTIPLE CHOICE Choose the letter of the best answer. For item 19-23 19. Determine the summation of the horizontal forces (Fx). 0 d. None of the choices 20. Determine the summation of the vertical forces (Fy). * 0 d. None of the choices 21. Determine the magnitude of the Resultant force (R). * 0 d. None of the choices 22. Determine the direction (6) of the Resultant force in reference to the x axis. * a. 62710 from positive y-axis b. 27.230 from positive y-axis c. 62.2100 from positive x-axis 0000 d. None of the choices