jhandy's advice is solid. If you suspect it to be the wheel bearing after doing what he's suggested, jack up the back end of the car and make sure it's very stable, then have someone you trust get in and fire up the motor and put it in gear and get it up to 30 mph+ while you keep your ear close, but not too close, to your back right wheel.
Then shut of the motor and let the wheels spin and listen. Being able to get near the sound is really helpful.
This is what my mechanic did to determine if my rear wheel bearings were worn and needed replacement. I was in the driver's seat and he was by the wheels listening.
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