Writing Exponential Functions from Scenarios A patient is given a 50 mg dose of medicine. The medicine's 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 patient's system after 2 hours?
A. f(x) = 50(0.40)x; 8 mg
B. f(x) = 50(0.60)x; 18 mg
C. f(x) = 50(40)x; 80,000 mg
D. f(x) = 50(60)x; 180,000 mg