it cost 14 cents to mail a postcard and 22 cents for a letter. David told me he wrote 14 friends and spent $2.84 for postage. How many letters and how many postcards did he write?​

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.