1. The problem statement, all variables and given/known data So that is the question. 2. Relevant equations The relevant equations I've used are: Ff=μN Ff=μkmgcosθ 3. The attempt at a solution I don't even know what Ff is? I believe this question involves using toa, cah, soh, but i really am confused about how i should go about with it. :( Can somebody please help me?