Question: How to change a tire on a vehicle.
Options:
First place jack under  vehicle, remove lugnuts, remove tire, put on new tire and tighten lugnuts, then lower car.
First place jack under and raise vehicle off ground, remove lugnuts, remove tire, put on new tire and tighten lugnuts, then lower car.
Answer: First place jack under and raise vehicle off ground, remove lugnuts, remove tire, put on new tire and tighten lugnuts, then lower car.