MeTheGummyBearBlah MeTheGummyBearBlah 11-03-2015 Mathematics Answered Which equations show that the set of whole numbers is closed under addition? Choose all answers that are correct. A. 0 + (–1) = –1 B. 1 + 1 = 2 C. 2 + 0 = 2 D. 2 + (–1) = 1