Question

Name the property used in each of the following

a) ( 2/3) + (-2/3) = 0 = (-2/3) + (2/3)

b) (-1/5) + (1/7) =(1/7) + (-1/5)

c) -1/3 + (2/5+2/3) = (-1/3+2/5)+2/3

d) -8/9 + 0 = 0 + (-8)/9