An event is certain to happen which number represents it's probability

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

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Suppose g(x) = f(x + 3) + 4. which statement best compares the graph of g(x) with the graph of f(x)?