[xXSupa]

I noticed that one of my tires are bald (Driver side, front). I'm not very experienced with tires and stuff, so I have a few questions that I wanted to ask.

Car: 2011 BMW X5, xDrive, 35i

1. If I were to change the bald tire, would I need to change the passenger side, front tire as well? There is still tread left on that one (About 40%)

2. Should I consider changing to a non-run flat tire?

3. What tire(s) would you recommend?

Thanks in advanced for any input!