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I also know the component forms of box A is Fy=22.68N and Fx=13.62N

both boxes are in contact?

u can draw the free-body diagram showing the forces acting on the box A and B?

for 2nd part i think :
we get 2nd formula equal to 0 and solve for mu k

^Sorry about the wait, but yeah it looks just like the image hosein drew

sorry i forgot this: theta oughtbe 60 degrees in formulas