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.