4 Lesson 3 Understanding Rational Inputs Cool Down Flea Treatment Veterinarians use different medications to treat fleas in dogs Once administered the medication typically decays exponentially One treatment decays by half each week A dog receives 4 mL of medication and the function f gives the number of mL of medicine left after w weeks 1 Find the amount of medication in the dog s bloodstream 1 week 2 weeks and 3 weeks after it is administered 2 Write an expression to represent the amount of medication in its bloodstream 1 day after it is administered 3 Explain what f means in this context