The answer will be D 15m+2n
I think they are not always the best deal, but most are. Sometimes they are not good if they opponent has a even lower price then them.
The answer is A; a=50t cause if you were to put 0, you would get 0 which is the first point, if you put in 1 you get 50, if you put in 2 you get 100 and so on.
I've included two pictures showing steps on how to solve. Hopefully this helps more than words.
Answer:
I hope this right
Step-by-step explanation:
16 in for the suface area so sorry if wrong