Plz help will give brainliest Find the area of a circle with a diameter of 16

Either enter an exact answer in terms of π or use 3.14 for π and enter your answer as a decimal.

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

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?