No, 120 and 835 are not relatively prime.
No.
no
15 is relatively prime.
Yes, they are relatively prime.
Yes, they are relatively prime.
Yes.
No
one, it is relativly prime. (:
As a product of its prime factors: 5*167 = 835
37 is a prime number but 42 is a composite number
No. They have 5 as a common factor.