IOAA 2nd problems: universe expansion

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Petch Phumrapee
Printed problem 3 on cosmic microwave background, parts a to d, covering horizon distances at recombination, horizon distance in degrees, communication between points separated by 5 degrees, and the size of the Universe at the end of inflation.

Could anyone please guide me how to do these problems?
 
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.