Plzz help me i will give bairnlest frfr and i will give you a 10/10 and a thank you

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

Two lines parallel to a third line are parallel to each other. always sometimes or never

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x, y) ?