Answer
$ \bar A =\{0,2,6,7,8\}$.
Work Step by Step
The given sets are
$A=\{1,3,4,5,9\}$ and $U=\{0,1,2,3,4,5,6,7,8,9\}$
The symbol $ \bar A$ means the set containing the elements of the union set not in set $A$.
Hence, the answer is $ \bar A =\{0,2,6,7,8\}$.
