what did churchill mean when he describe russia as being "a riddle wrapped in a mystery inside an enigma?"

Basically Churchill means to say "I don't know much about what Russia's gonna do"

Mysteries, riddles, and enigmas are all synonymous with "unknown".

So there's no telling what Russia's gonna do... trying to figure out what they're gonna do is like trying to answer an impossible question.

1) the degree of the function is odd, so the ends of the graph continue in opposite directions. because the leading coefficient is positive, the left side of the graph continues down the coordinate plane and the right side continues upward.