I dont understand the question

The expression 42 plus 57 shows how much money nate spent at a store .which expression also shows how much money nate spend

Statement: if two distinct planes intersect, then their intersection is a line. which geometry term does the statement represent? defined term postulate theorem undefined term

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles