Answer
$[-4, 6)$
Refer to the graph below.
Work Step by Step
The given inequality is $4\leq x \lt 6$.
Left bracket indicates that $4$ is part of the graph while a right parenthesis indicates that $6$ is not part of the graph.
Thus, the closed interval is $[4,6)$.
To graph, uses a bracket at $4$ and a parenthesis at $6$, then shade the region in between.
Refer to the graph below.