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I am having issues answering these 2 questions:(a) Find the velocity of a galaxy if it is 8.22 Mpc away

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I am having issues answering these 2 questions:(a) Find the velocity of a galaxy if it is 8.22 Mpc away.
(b) Find the distance to a galaxy if it is moving away at a speed of 50,000 km/s.

I am not able to understand how to properly work the formulas to get them to the given answers.

Answer: 592 km/s, 694 Mpc

 
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