Yes and it is 7/9 simplified
No.
9 over 13 NO! 9/7 * 9/6 = 9/7 * 3/2 = 27/14 which can be simplified to 113/14 At the second stage 9/6 was simplified to 3/2 using the common factor 3.
7/9 is in its simplest form.
7/9
It is 7/9
9/7
It is: 63/9 = 7/1 simplified
9/21 = 3/7 = .4286
7/9
Yes, 28 over 36 = 7 over 9
1 over x2