Doppler Shift homework. I need help!

For my astronomy homework, we are using the Doppler Shift. We have a table with columns named: Observed Wavelength A, Rest Wavelength A (the next column is the difference of the 2), v/c, v km/sec, towards us or away from us.The example he gave us in the columns respectively is: 3931.9, 3933, -1.1, -0.00028, -89.3, towards.I dont know how to figure out v/c, v km/sec, and whether it is towards or away from us. I hope I can get some help on this! Thanks.; For my astronomy homework, we are using the Doppler Shift. We have a table with columns named: Observed Wavelength A, Rest Wavelength A (the next column is the difference of the 2), v/c, v km/sec, towards us or away from us.The example he gave us in the columns respectively is: 3931.9, 3933, -1.1, -0.00028, -89.3, towards.I dont know how to figure out v/c, v km/sec, and whether it is towards or away from us. I hope I can get some help on this! Thanks.

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