Where do I find out what gate to go to pick up my friend who is coming in from Las Vegas to Los Angeles on a Delta flight?

You can either ask your friend; that info is on boarding pass; or using maps let it know that you need to go to arrivals for Delta it'll help you.

Thank you. If not for all the construction going on there. Everything would be a lot easier and better than it is now to find. Sadly enough I continued to go in circles because of it. My suggestion is if you can not find it on 1st or 2nd try to park in one of the garages and walk to the terminal. Lot easier and less of a headache.