This is Calculus course especially about vectors. I need help with some questions. I also attached formula sheet in case you need it as a reference.

15. Three forces are acting on an object: 350N in the direction [N45.E] , 600N in the direction [N30.E] and 100N [S]. Use the method of vector decomposition to find the equilibrant force and answer in scalar component form. [4A marks]If c , b, a are 3 non-zero vector, where c . (b x a ) = 0 , what can you say about the vectors c , b, a ?17. An object is hanging from two ropes. One has a tension of 200 N and makes an angle of 50 with the ceiling. The other rope makes an angle of 40 with the ceiling. Calculate the mass of the object. g=9.81 [4 marks]Formulas: a . b = lal|b|cose |axb = lallb|sine a a = lal scalar proja onto b = lalcose vector proja onto b = lalcose W = |d| |F|cose IT| = 171/F/sine Area of a paralellogram = lax b|