Equilibrium and tension in elastic strings

[abdo799]

Homework Statement

problem attached

Homework Equations

The Attempt at a Solution

well, there is pretty much nothing i can write here, i couldn't solve it because this is the first time i face a problem like that , i have some problems understanding it though
1-if we considered the tension a force that make a moment , (eg tension in PC ) where will be that force so i can take a distance will it be at P or C ?
2- in other problems of equilibrium , when i take the distance , i take the distance to pivot ( in this one A ) but in this one , in the marking scheme , he took the distance to AB , and not the point A , why?
3- he took the force of tension in the horizontal string to have a moment and when he mentioned the distance , it was the distance to the point A and not the vertical AB why?

 

[abdo799]

Never mind.. a friend saw the question and answered me
Thanks