Visibility logic

Hi,

Maybe You can tell me how write a visibility logic.

First situation:
I want that if 9 first checkbox is selected and in 9.1. enter number then show 10 control.

Second situation:
If 9 first checkbox  is selected and in 9.1. enter number and if 9 second checkbox is selected and in 9.2 or 9.2.1 or 9.2.2 or 9.2.3 or 9.2.4 enter number then show 10 control