Big road inc., a private company, is hired to build and run a state’s entire road system. the company charges high fees to use its roads. it maintains the roads only in heavily populated areas. which of the following describes this project?
a. positive externality
b. public good
c. market failure
d. negative externality

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: (