Lily performs a study to learn about caffeine and how body's react to it. She collects data to learn how quickly the human body metabolizes caffeine. Each person has 200mg of caffeine. Then she measures the level of caffeine at specific times in the blood stream. She then collects data values and plots them on a coordinate grid (x is mg of caffeine in the blood and y is time in hours) 1. What info will her graph give her about the type of mathematical relationship that her study will reveal? 2. What mathematical technique can lily use to determine the kind of relationship modeled? 3. What characteristics of the equation or graph should lily examine to determine the relationship being modeled