Answer: 2
Step-by-step explanation: because the x in the middle has to be the same
Table A represents the function, because if you look at the other tables they are all relations as in order to be function we need to have one x- value coordinating to one y-value. but the other tables have multiple x-values corresponding to y values.
This is a bit confusing, double check if you typed everything correctly.
Since 45 = 45
then the two other sides are equal
(15)^2 = (side)^2 + (side)^2
225 = 2 (side)^2 divide 2 to both sides
112.5 = (side)^2 square root
side = 10.6
this is my answer