What plant or weed is this?

Question

Its about 6 ft tall, not sure what it is, want to tear it out.

Answer 1

Well, the flower stems and flowers look exactly like Galinsoga quadriradiata (link below), commonly known as Shaggy Soldier, Quick Weed, Peruvian Daisy, take your pick - but that usually only gets about 2 feet, and the leaves don't seem quite right on this plant. Could there be more than one type of plant growing together, and the flowers we can see are not part of the main foliage that's visible, but simply intermingled?

https://en.wikipedia.org/wiki/Galinsoga_quadriradiata

The foliage actually resembles one of the Chenopodiums, possibly Chenopodium album or C. murale (amaranth family), but that isn't usually as tall and has an inflorescence at the top for flowers which are not at all daisy like in form. C. album pictured here:-

http://www.apatita.com/herbario/Amaranthaceae/Chenopodium_album.html

I just noticed another question of yours about a weed that isn't a tomato (pokeweed) - I'd recommend you do a bit more weeding about the place, since the two plants in this question are also considered weeds, on the assumption you didn't actually plant them.