4/9 is the additive inverse of which number?-4/9-9/44/99/4
4/9 + -4/9 = 0 which is the additive identity....therefore -4/9 is the additive inverse...
-4/9 x is the additive inverse of y IFF y + x = 0 Thus the additive inverse of a real number is the negative of that number, since you have +4/9, the additive inverse is -4/9 Edit: Actually, what I have written is not really the definition of the additive
