It can be. 28 is relatively prime to 33.
It can be. 15 is relatively prime to 16.
It can be. 27 is relatively prime to 28.
No, they are not relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes, 4 and 15 are relatively prime.
No, 28 and 34 are not relatively prime. No pair of even numbers can be relatively prime, as they always share at least one factor (2).
No, they are not.
No they are not.
No. Even numbers can't be relatively prime to each other.
Yes.