Water is added or drained from a tank each day. The first day, 13/10 of a gallon is added to the empty tank. The second day, 11/10 of a gallon is drained from the tank. The third day, 12/10 of a gallon is added to the tank. The fourth day, 1 gallon is drained from the tank. The amount of water in the tank after 15 days is given by

Problems and applications q5 four roommates are planning to spend the weekend in their dorm room watching old movies, and they are debating how many to watch. here is their willingness to pay for each film: willingness to pay (dollars) shen antonio dmitri jake first film 10 9 8 3 second film 8 7 6 2 third film 6 5 4 1 fourth film 4 3 2 0 fifth film 2 1 0 0 within the dorm room, the showing of a movie a public good. if it costs $12 to rent a movie, the roommates should rent movies in order to maximize the total surplus. suppose the roommates choose to rent the optimal number of movies you just indicated and then split the cost of renting equally. this means that each roommate will pay $ .