Unit 8: Right Triangles & Trigonometry, Homework 8: Law of Cosines.

I don't understand how to write out the work. Help would be lovely :))

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.