What property is demonstrated 4/5+(-4/5)=0

 is the ADDITIVE INVERSE of

and  is the ADDITIVE INVERSE of

Step-by-step explanation:

A number P is said to be the ADDITIVE INVERSE of the quantity Q

if and only if P  + Q   =    0

or if sum of any two terms is equivalent to 0, then they are additive inverse of each other.

here, P is the additive inverse of Q.

and   Q is the additive inverse of P.

Now, here given :

It implies by the definition of additive inverse  that:

 is the ADDITIVE INVERSE of

and  is the ADDITIVE INVERSE of

probably .5

i can on others if necessary.