How do i find this find x and y

How long would it take for a ball dropped from the top of a 576-foot building to hit the ground? round your answer to two decimal places.

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

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?