Respuesta :
Answer: A and B
Explanation: A sum is an answer to an addition problem and a difference is the answer to a subtraction problem. N is the sum to the addition problem and -n is the answer to a subtraction problem.
Answer is A
You can plug numbers in to check:
a) n=5
5+(-5)=0
b)n=5
5-(-5)=5+5=10
c) n=5
5(-5)=-25
d)n=5
5/-5=-1
You can plug numbers in to check:
a) n=5
5+(-5)=0
b)n=5
5-(-5)=5+5=10
c) n=5
5(-5)=-25
d)n=5
5/-5=-1