No, they are not relatively prime.
It can be. 16 is relatively prime with 25.
Yes, they are relatively prime.
It can be. 26 is relatively prime to 27. 26 is not relatively prime to 34.
It can be. 27 is relatively prime to 28.
No, they are not relatively prime.
No, they are not relatively prime.
Yes, they are relatively prime.
9 and 16 are relatively prime.
Yes, they are relatively prime.
No because they are both composite numbers with more than two factors
14 = 2 × 7 27 = 3³ → hcf(14, 27) = 1 → 14 and 27 are relatively prime.