no
No.
The expression (12x + 36)/48x can be simplified by factoring out 12/12 from the expressions. This leaves (x + 3)/4x.
No, you can't.
1 over 2
25 over 16.
13 over 16
1/4
20/16 = 5/4
4/11
Yes and it is 16/40 = 2/5 simplified
That can't be simplified. 25 and 16 have no common factors.