Can one delete one's question from Yahoo Answers?

Only if nobody has answered the question, if they haven’t then click the edit button on your question and there should be an option to delete it. 

IF your question on Yahoo Answers has no answers yet, you can just go into your question and select Edit>Delete. (make sure your mobile device is in desktop mode, if using a mobile)

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IF your question on Yahoo Answers DOES have ANY answers, it cannot be deleted. The only way to get it removed if it has answers from others, from that point on, is to have enough accounts report it as a violation, so the system removes it from the display. You cannot edit or change the info you posted, either. All you can do is add updates to clarify it, and/or make yourself Anonymous (Edit>Post as Anonymous) to hide your identity. The site was designed to be a database of knowledge/experience for anyone to access. Allowing users to delete questions defeats that purpose.

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This is probably the single most asked question, over time, in the Yahoo Answers subcategory. You can save time in the future, by doing a search at the top of the page (type in your question or keywords and press "Search Answers"), to see if the question you have has already been asked/answered. How to delete questions has been asked/answered literally thousands of times since the site was created.

No, you cannot, once the first answer is posted. 

Once the question has an answer.......you lose the ability to delete it yourself. 

If your Referring to your own

you can only delete your question if it has no answers on it if there are

no answers on it to delete it click on the x delete question button under the

blue edit menu once there is answers on it you wont be able to delete it

unfortunately 

No

You can only delete them if they have no answers. Click on 'Edit' beside your question and then delete it. If it has an answer the Edit button no longer appears and you cannot delete it.