Question

Someone please help me if you do i'll give you a medal and fan

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

(It's more than one answer)

Answer 1

@Destinycholie @Alfa_female @campbell_st @Nnesha @KamiBug

Answer 2

:(

Answer 3

i think its B and D

Answer 4

okay thank you so much