Does anyone want to help me with my math work?

Statement: if two points are given, then exactly one line can be drawn through those two points. which geometry term does the statement represent? defined term postulate theorem undefined term

Which represents the solution set of the inequality 5x-9 < 21? a. x < 12/5 b. x > 12/5 c. x > 6 d. x < 6

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?