18 = 2 x 32 and 55 = 5 x 11 so yes it is.
55 and 72 are relatively prime because they have no prime factors in common.
No.
Yes
Any odd prime number.
No. Both 18 and 33 can be divided by 3, which means that they are not relatively prime.(TIP When someone asks you if the numbers are relatively prime think of a number that both numbers can be divided by to get a whole number. With that you should be able too see strait away which numbersare relatively prime.)(Relatively prime means any amount of numbers that can only be divided by 1 and themselves )Hope I helped! :) XD
55 and 72 are relatively prime because they have no prime factors in common.
No, they are not relatively prime.
No.
Yes, 55 and 62 are relatively prime because they have no common factor greater than 1.
Yes
Yes
All odd numbers that can not be divided by 3 evenly would be relatively prime with 18.
Yes, they are. 5 is the only prime factor of 25 and 5 is not a factor of 18, so they have no prime factors in common, which is what relatively prime means.
No, they are not.
no
Yes.
Yes