Respuesta :

1 C: The sum of 2 opposed numbers is 0, got that?
2 B: We may add the same numbers to the 2 members of an equation, we get an equation. OK. This was my own work. Hope i could help!
Thunderclan89
apologiabiology
A: distributive property
B: addition property of equality
C: additive inverse (x+(-x)=0)
D: zero property of addition