1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution Free body diagram Setting moment at the origin = 0 (Rb X B) + (Ra X A) + (Rc X C) = 0 solving the 3 determinants and setting the coefficients of i, j, and k to 0, I get: 8Bz - 10 Cy = 0 -12 Az + 10 Cx = 0 12 Ay - 8Bx = 0 I have too many unknowns. summing forces : ∑Fx = Bx + Cx = 0 ∑Fy = Ay + Cy - P = 0 => Ay + Cy = 380 ∑Fz = Az + Bz = 0 I still have too many unknowns. Any suggestions?