Yes.Yes.Yes.Yes.
No. It simplifies to 1 1/8
21 over 72, or 7 over 24 (simplified)
55 and 72 are relatively prime because they have no prime factors in common.
6√2
No.
47/72 is already simplified
-13/72 cannot be simplified.
It is: 72/96 = 3/4 simplified
3/5 is simplified by 33/55
no
No, it cannot.
It is 11/12 when simplified (divide both the 55 and 60 by 5).
72/100 = 18/25
72/83 is simplified.
It is: 72/66 = 12/11
52/72 = 13/18