Explain how you would use this information to 1) calculate the redshift of this galaxy, 2) convert this redshift to a velocity for the galaxy, and 3) determine the distance to this galaxy given its measured redshift.
Show your calculations, instead you should describe the steps in going from the measurement of the wavelength of a line in a spectrum to the distance to the galaxy. However, if you would prefer to show the equations or calculations in your answer, you can do so.