What does the prefix deca- in the word decathlon? The decathlon was a track field competition in the Olympic games as early as 1904

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Could someone me with this question?

"introduction to oedipus the king": what is most likely the author's intent in writing about the difference(s) between sophocles's play and the original myth on which it's based?

“to build a fire” what does the man realize as he’s trying to light the matches? what difficulty occurs when the man finally lights all of his matches at once?