Which of the following are examples of exponential decay?Which of the following are examples of exponential decay?

The population of a Florida is increasing by 43% each year.
The pesticide DDT has a half-life of 15 years.
March Madness has 64 teams in the bracket. Each round, half the teams are eliminated.
After an antibiotic is added to a culture of bacteria, the number of bacteria is reduced by half every three hours.
A tree frog population doubles every three weeks.

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 $ .