11.
-0.5757575757
this is rational, 10 digits long, and has a 2 digit repeating pattern
12
irrational number between 5 and 6 would be root27, which is about 5.196
i assume this follows the ten digit rule, it has infinite digits
13
rational number greater than 3, 4 digit repeating number
3.123412341234
14
-3.623623623623
15
Φ/2
π/4
16
π