Purple stone traded by ancient merchants in eastern oklahoma

What were the sites of three major battles the french army fought between 1805 and 1809?

West africans received salt from who?

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: (