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.