F$-6.[10$ PIS$]$ For the system shown below, calculate the reactions at point $A$ if the coordinates of poimts $A-D$ are:

$A=(0,0,0)m,B=(-2,1,10)m,C=(0,0,11)m,D=(8,0,10)m$

and the forers and moment are given by:

$F_b=5i-100j+5k(N)$

$M_C=-50i+75j-320k(N-m)$

$F_D=-100i-10j+7k(N)$