How do you show your work on order of operations: basic

I think you first show your work and how you show your work is like 42 divide by 4 and than i do what i do and than when i have a answer i put it on my answer and than i show my  teacher
than i do my other

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.