C(5,-5),D(5,3) what is the distance between the points

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Determine whether the points (–3,–6) and (2,–8) are in the solution set of the system of inequalities below. x ? –3 y < 5? 3x + 2 a. the point (–3,–6) is not in the solution set, and the point (2,–8) is in the solution set. b. neither of the points is in the solution set. c. the point (–3,–6) is in the solution set, and the point (2,–8) is not in the solution set. d. both points are in the solution set.

Which equation is y = -6x2 + 3x + 2 rewritten in vertex form?