Question

Roman civilization began in 509 BC and ended in 985 BC years later. what year was that?

Answer 1

the answer:

the main rule is shown on this line:

BC years birth of christ AD years
985bc 509bc 3bc 2bc 1bc 0
---/---------/------------/--------/-------- /--------//--------/------/------------/-----------Now

-985 -509 -3 -2 -1 0 1 1900 2017

looking at this image of time the year was at -985

Answer 2

I think that the idea is something like this:
- 509 + 985 = 476
So the question must be: " Roman civilization began in 509 BC and ended in 985 years later ( not 985 BC years later, it does not have a sense )".
Answer:
Roman civilization ended in 476 AD ( and it is historically true ).