It is, and always is relatively prime.
Any two different prime numbers are relatively prime because relatively prime numbers are sets of two or more numbers having 1 as their greatest common factor.
The GCF of relatively prime numbers is always 1, by definition.
Always
Yes. In general, if you have two different prime numbers, they will also be relatively prime.
No.
A pair of prime numbers are always relatively prime, whether they are consecutive or not. This is so because "relatively prime" means they have no common factors.
No, only if the numbers are relatively prime.
Yes.
Yes.
No, they need not be.
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).