Help!!! please answer all clearly

Q 1) Cables AE and CF are fastened to either side of a triangular plate to keep it from rotating about line DB. Points E and F are fastened to the ground in the x- 2 plane. If the tension magnitude in cable AE is FAE 55 N, ' a) Compute the moment about point D created by tension vector 13,\"; (pointing from A to E). Express the moment in Cartesian notion. b) Compute the magnitude of the moment that force 13:45 creates about the axis passing through D and B. ' c) Determine the tension required in cable CF (magnitude of force F'CF, pointing from C to F) that would cause the combined resultant moment about line DB to be zero