-x^2+17x-42 in quadratics, graph starting at (3,0), and repeated vertices at (8,30) and (9,30). What do I do if there’s a repeated vertices?

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.