1. The user requested to export all eight solutions in PDF format. 2. As an AI text-based assistant, I can provide solutions and explanations but cannot directly export or create PDF files. 3. You can copy the solutions I provide and use a text editor or word processor to save or export them as a PDF. 4. If you want, I can list all eight solutions here for you to copy. 5. Please specify the exact problems or solutions you want exported, and I will provide them in detail.