I am buying a dell computer that comes with a Single Drive: 16X CD/DVD burner (DVD+/-RW) w/double layer write capability. Would this allow me to rent a dvd and burn it onto a blank dvd disk?
No 
what would i need then?
you’d probably need to read the forum rules before posting again…
You need to buy movies 
ok so if i wanted to make a backup of a movie i bought would that burner do the trick?
Maybe - and never the burner alone.
First buy the movie(s), then ask again.
Well it looks like everyone got the point across so I will just post a link the rules in case you missed it. Forum Rules.
skidive00001. Please do not double post. That is also in the Forum rules.