What two numbers can be used in place of the? to make the statement true.
i? i =8/9

Since the absolute value makes numbers absolute or real numbers you could replace the ? with 8/9 or -8/9 since the negative will go away because of the absolute value sign.

No because if you do the higher number minus the lower number you will get a positive. if you do it the other way around you will get a negative number