The free$-$body diagram shows the all of the forces acting on an object of mass $\mathrm{????}=6\mathrm{.}1\mathrm{????}\mathrm{????}.$ The three forces have magnitudes ${\mathrm{????}}_1=13\mathrm{????},{\mathrm{????}}_2=20\mathrm{.}7\mathrm{????},$ and ${\mathrm{????}}_3=17\mathrm{.}8\mathrm{????},$ with directions as indicted in the diagram, where $=38\mathrm{.}7$ degrees.

Part c What is the magnitude acceleration? 

Part d what angle in degrees does the acceleration make with respect to the positive x axis?