There are 70,000 bacteria present in a culture. An antibiotic is introduced to the culture and the number of bacteria is reduced by half every 4 hours. Which of the following statements are true? Select all that apply.
1. After 4 hours, there will be 35,000 bacteria remaining.
2. After 8 hours, there will be 17,500 bacteria remaining.
3. After 12 hours, there will be 8,750 bacteria remaining.
4. After 16 hours, there will be 4,375 bacteria remaining.
5. After 20 hours, there will be 2,187.5 bacteria remaining.