No.
No, it can not because 10 and 13 have nothing in common.
10/13
It is: 10/65 = 2/13
It is: 91/70 = 13/10 simplified
40/52 = 10/13
23
It can not be simplified further.
13/9 cannot be simplified.
yes, because 13 and 130 are both multiples of 13, or in other words, they can both be divided by thirteen. the simplified fraction is 1/10.
-13/72 cannot be simplified.
Yes, it is simplified.