please help

The energy difference between two energy shells is calculated using the formula E=EfEi where Ef is the energy of the final shell, and Ei is the energy of the initial shell from which the transition occurs. For example, for the transition n=4 to n=1, the initial shell is the fourth shell, and the final shell is the first shell. Thus, the change in energy between the fourth and the first shell is denoted as E=E1E4. The energy corresponding to a shell is calculated using where n is the shell number. Enn=2.1791018/(n)2J Part B - Calculate the energy difference Calculate the energy difference for a transition in the Paschen series for a transition from the higher energy shell n=7 Express your answer to four significant figures and include the appropriate units