Help pleasee its due soon! I only need help with b

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

If jaime wants to find 60% of 320, which table should he use?

Need on this geometry question. explain how you did it.