I am revising with past papers for the 2009 Standard Grade Credit Maths. Would appreciate some help with the following past paper example.

Solve algebraically the equation

5 cos xo + 4=0, 0 ≤ x ≤ 360

If anyone knows where I would be able to obtain Standard Grade Credit past paper exemplar answers (that show working not just the end result) would much appreciate if you could let me know

I have only got around 2 months left to exam time and need all the help I can get

Thanks in anticipation