Carlos is buying milk. he needs 3 liters. A​ half-liter of milk costs ​$2.16. A ​200-milliliter container of milk costs ​$1.17. What should Carlos buy so he gets 3 liters at the lowest​ price?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.