Question

Identify the property used in the following:
a) 13/21+(-13/21)=0=(-13/21)+13/21

b) 4/11+3/7=3/7+4/11

c) 2/3+(4/5+-6/7)=(2/3+4/5)+-6/7​

Answer 1

Answer:

this is a wrong question dude i think so