1. To provide final answers for questions 5, 6, 11, 15, 16, 19, and 20, specific problem statements are needed. 2. Please provide the text or details of each of these questions so I can calculate and present the final answers accurately. 3. Without the problem details, giving final answers is not possible because each question likely involves unique calculations or steps. 4. Once you provide the problems, I will solve each step-by-step and give the final answer clearly. 5. Please share the content of questions 5, 6, 11, 15, 16, 19, and 20 for assistance.