Absolutely! The very moment you turn 18 you are considered an adult, as per NRS 129.010 which declares as follows:
NRS 129.010 Age of majority. All persons of the age of 18 years who are under no legal disability, and all persons who have been declared emancipated pursuant to NRS 129.080 to 129.140, inclusive, are capable of entering into any contract, and are, to all intents and purposes, held and considered to be of lawful age. [1:19:1861; B § 323; BH § 4943; C § 5000; RL § 431; NCL § 300]-(NRS A 1971, 455; 1973, 1578; 1987, 1281) Basically, you are free to do as you wish as concerns where, and with whom, you choose to reside, unless you have been legally declared mentally or physically disabled (to the extent a court determines you are not capable of competently caring for yourself) with guardianship awarded to your parents previous to your 18th birthday. However, also be aware the moment you turn 18 you are technically considered to be a guest in your parent's home with your continued residence entirely at their volition.
No.
Yes.
Yes. At 18, it doesn't matter if you are still in school, you can move out.
yes
If you're in the US, once she turns 18, she can move out, and no, you do not have to support her.
yes
Yes.
yes
That will depend on your location. Some states require you to finish high school first.
actually yes. i graduated but i still wanna go to high school. i am wanting to go to a high school whose age limit is 21 or 22
Yes, as long as you comply with Nevada's requirements on the move.
Yes an 18 year old can move out.. it doesn't matter if you are in high school or not. You are a legal adult and are perfectly capable of making your own decisions.