With regards to finding the angle (theta)

u = 0.22

m = 8

when mg*Sin(angle) = uN

and mg*Cos(angle) = N

so then I work out:

mg*sin(angle) = 0.22*mgCos(angle) ........after this i get lost,

You narrow it down to 0.22*Cos(angle) =

Tan(angle) = 0.22

I Know the answere is roughly 12.4, could someone please run through this for me, Thanks!