I managed to do most of the question(whether it's wrong or right), Figured out friction was 7.23N, and the box slides down with 9.64 N if the force is not applied... But what I'm confused on is, how do you use a Y component to cancel out the x component? (I mean if you draw a coordinate plane perpendicular to the incline, then the 9.64 is going straight down the x axis and the perpendicular froce being asked is going straight down the y axis)

I figure if the load cant slide forward, the net force should be 0, therefore accerlation must be 0 too, but thats where I'm stuck...