Hi, I'm doing homework and there are a few problems I don't understand at all.

re: different types of numbers:

[4] would e/e be irrational since e is irrational or would it be a natural number since e divided by itself would just I guess be 1?

[5] 2.121121112 would be irrational I guess since the number is not completely repeating but changes?

thanks so much in advance for the help!!