Please help with this problem

Find the domain of the following expression: 1/(√x)-2

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by

Ihonestly have no clue if it's each or none.