F1 = 310 N,
F2 = 280 N,
F3 = 400 N.
Sum of vertical component:
Fy=F1y+F2y+F3y=F1sin45°+F2sin45°+F3sin80°=310⋅0.7+280⋅0.7+400⋅0.98=811.1 N
Sum of horizontal component:
Fx=F1x−F2x+F3x=F1cos45°−F2cos45°+F3cos80°=310⋅0.7−280⋅0.7+400⋅0.17=90.7 N
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