According to Hubble's law, what is the recessional velocity of a galaxy that is 108 light-years away from us? (Assume a Hubble constant of 22 km/s per million light-years.)

the recessional velocity of the galaxy is 2.736*10^-3 km/s

Explanation:

for the recessinal velocity of the galaxy as v and d being the distance of the galaxy from us and H as the hubble constant, then hubbles law says:

v = H*d

= (22 km/s per million light years) * 108 light years

= (2.2*10^-5 km/s per light years) * 108 light years

= 2.376*10^-3 km/s

Therefore, the recessional velocity of the galaxy is 2.736*10^-3 km/s