“i was supposed to make american goods cheaper than
foreign imports, but i led to a severe decrease in
international trade when europeans responded to me
with tariffs of their own. what am i? ”

You are given the first four terms of an arithmetic sequence. why might you use a recursive formula? why might you use an explicit formula? under what conditions might a recursive formula be preferred over the explicit formula? under what conditions might an explicit formula be preferred over the recursive formula? pleasss ! sorry if it's a long question: (