when i reach 50+ miles per hour the steering wheel starts shaking, someone help. on 2000 Nissan Xterra

It started about a few months ago how much to fix if worth it or sell car.

Asked by for the 2000 Nissan Xterra
2 answers
check tire condition and balancing. also check steering and suspension for looseness or play
On my 2000 xterra it was lower ball joint. I was told u have to replace the whole lower control arm