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Hello gull05,
Threads close themselves after a period of time with no activity. We generally only force a thread to close if it is a duplicate thread, spam (which will be closed and removed), a mis-filed homework assignment, or some other violation of forum rules.

If is important to mark threads resolved when you get a satisfactory resolution to your questions. (And, both of these threads have been marked solved.)

If you didn't mark them yourself, the way to do that is to follow the directions in the Tags frame just under the title of the thread on every page of the display for that thread. Hit the Edit Tags button at the top right of that frame, add a solved tag (and any other tags that specify the nature of the problem and the tools that were used to resolve it, and then hit the Save Changes button in the Tags editing window.