posted by Marie .
Could someone please explain the union to me. I don't understand. I get the intersection ones but not union. HElp me?
intersection is where the intervals overlap
union is evetrything in either one
(-1,1) extends from -1 to 1
[0,6] extends from 0 to 6
If you supermimpose the two shaded intervals, you will see that the combined shaded interval is
The stuff in [0,1) is shaded twice, but that's ok. It's part of everything that's shaded.