Interpretation: The table and the graph show that the drug is most effective after 2 hours where it peaked at 2.67 mg/L. The Domain and Range of the given function are D (x ER) x201 R ly ERly 20) Now, It's Your Turn 1. Create your own or similar real-life situation where rational function is applied. 2. In a bond paper, present the problem from field of application up to presentation as illustrated above. 3. You can use graphing paper to graph the function. You can also use calculators to solve the table of values.