My final balance after 48 months was 896.00 if i originally put 800.00 into the bank what was the interest rate

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

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2