yes
Push up on it turn ninety degrees and pull.
because i farted :D
of course it is the iron screw because it is made up of minerals that rust faster then metal
Usually with the tire iron/wheel wrench included with the jack. If that is missing, try a ratchet with a socket that fits. I've even used a screwdriver to twist it half-turn by half-turn.
How to Use a Wrench as a Tool
How to Use a Screw Extractor
How to Turn with a Screw Center
Screwing Through Carpet