Worth 10 points please help me ASAP!

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

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)