How do I check the tire pressure on a 2018 Toyota Corolla?

The key fob for my Honda Civic stopped working, and now I have to unlock the door by hand. It’s kind of annoying, but the real problem is I keep forgetting to lock all the doors without the remote. How can I change the key battery for my Honda Civic?

My side mirror has started wobbling a bit when I drive. It’s not anywhere near falling off, but it is annoying. How do I tighten it?

I'm looking at a Honda Civic that costs $25,000. I have $12,500 for a down payment. When I told the salesman, he gave me a weird look and said that was probably too much to put down. I've heard from other people that a large down payment means that car dealers are more likely to give you a deal.