One number, by itself cannot be relatively prime - or otherwise. Relative primality is a property of two (or more) numbers.
It can be. 40 is relatively prime to 41. 40 is not relatively prime to 54.
It can be. 34 is relatively prime to 35. 34 is not relatively prime to 40.
No, 30 and 40 are not relatively prime. Their greatest common factor is 10.
ya they are relatively prime
Yes.
No.
No, they can be both divided by 10
No, both of them can be divided by 10
No, because 5 divides both 40 and 135.
No, they are not relatively prime.
No, they are both even. That means they have a common factor of 2.
Relatively prime numbers only have 1 as a common divisor. 38 and 40 have 1 and 2.