HELP! Historians use the term "American Indian" to refer to the people of .
American Indians already lived in North America long before European settlers arrived.
Historians speculate that at least ___ million American Indians were inhabiting North American lands before
their first contact with Europeans.

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: (