Answer
$ sin(x)=-\frac{2\sqrt 2}{3}$ and $ tan(x)=-2\sqrt 2$
Work Step by Step
Given $ cos(x)=\frac{1}{3}$ and $ x\in[-\frac{\pi}{2},0]$,
we can predict that both $ sin(x)$ and $ tan(x)$ will be negative.
The three sides of the right triangle can be chosen as $1,2\sqrt 2, 3$, so $ sin(x)=-\frac{2\sqrt 2}{3}$ and $ tan(x)=-2\sqrt 2$
