Can You Tell if a Problem Does Not Have an Answer?

When people started writing down axioms for deducing things, mathematical proofs, in the early 19 hundreds, we had questions about, can we answer every question? If some one gives you a statement, can you say for sure if it's true or false? Isn't that? And there was a problem, tho, i swear i was thi was a problem that we spoke about. Again, i can, i can reference it in a second, but it's not on the top of my head. But anyway, yes, anyways, yes. There are mathematical statements that are true that we cannot prove. Its too general. Too many different rules you can assign. It's really