I need assistance with figuring out how to work through these questions:

1) What is the wavelength of the 3rdline in the Paschen series?

2) What is the wavelength of the fourthline in the Balmer series?

3) What is the smallest wavelength in the Lyman series? (Hint: think about the initial energy level n_i to have the smallest wavelength)

4) If a hydrogen atom has its electron in the n = 3 state, calculate the electron's energy in joules.