21.)Steam power, the growth of railroads, free enterprise, and mass production lead to a decrease in

A. the costs of goods.

B. the number of farms.

C. leisure time.

D. the wages of workers.

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: (