ANSWER
4 units.
EXPLANATION
Triangle RQT is a right isosceles triangle.
This implies that:
RQ=RT=x.
Triangle RTS is also a right angle triangle with hypotenuse, RT=x.
Also, the side with length , 2√3 units is opposite to the 60° angle.
We use the sine ratio, to obtain:
[tex] \sin(60 \degree) = \frac{opposite}{hypotenuse} [/tex]
[tex] \sin(60 \degree) = \frac{2 \sqrt{3} }{x} [/tex]
Solve for x to obtain;
[tex]x= \frac{2 \sqrt{3} }{ \sin(60 \degree)} [/tex]
This gives us:
[tex]x= \frac{2 \sqrt{3} }{ \frac{ \sqrt{3} }{2} } = 4[/tex]
Therefore the value of x is 4 units.