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F1=16.90 cos 46 x+ 16.90 sin 46 y

F2= 7.20 cos 119 x +7.20 sin 119 y

f3= 9.20 cos 218 x + 9.20 sin 218 y

I keep getting the answer .422 m/s^2, however i am told this is incorrect. I calculated the x and y components for the forces, then added them independently and then I divided each by the mass (after converting to newtons) which should give me the acceleration. I then calculated the magnitude by using the pythag. theorem. is there a step i am missing or am i completely off????