Final answer:
The subject of this question is Computers and Technology, specifically related to bike repairs and maintenance.
Step-by-step explanation:
The subject of this question is Computers and Technology. Paul, the student mentioned in the question, is constantly in his garage fixing bikes and on the mountain trails riding them. When faced with bike problems, Paul might use various tools and technologies related to bikes, such as bike repair guides, bike mechanics, bike maintenance apps, and online bike communities to seek help and find solutions.