What is the energy of the electron in `He^(Theta)`in the ground state ?

What is the energy of the electron in He+ ion in the ground state ?

What is the energy of the electron in He^(+) in ground state?

Calculate the energy of the electron in the ground state of the hydrogen atom.

In the question number 75, if ground state energy of electron is -13.6eV then what is the ground state energy of muonic hydrogen atom?