I IOAA 2nd problems: universe expansion

Petch Phumrapee
upload_2017-8-3_20-33-18.png

Could anyone please guide me how to do these problems?
 
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Petch Phumrapee said:
Could anyone please guide me how to do these problems?

Please post each problem individually in the homework forum, using the homework template. That will require you to make some effort to solve them yourself.
 

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