PLEASE HELP The graph shows the amount of a medicine m in miligrams, remaining in a patients body h hours after receiving an injection. the amount of medicine decreases exponentially.

1. by what factor did the medicine decrease in the first hour and a half? explain how you know

2. by what factor did the medicine decrease in the first half hour? what about in the first hour? explain how you know

3. write an equation relating m, the number of milligrams of the drug in the patients body and h the number of hours since the injection.