can u help me plz its on math and its timed this is how my teacher explined it but i ont understand 13 points

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

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

Javier bought a painting for $150. each year, the painting's value increases by a factor of 1.15. which expression gives the painting's value after 77 years?