augusta descent took 3 hours and went down 52,940 feet. Write account relationship to represent his descent

Question and answers are in the attached picture. you so much in advance.

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours

Ineed to know the answer to this algebra question.