help!!

I think the answer may be 2

$\frac{12}{3}\sqrt{2} \\~\\ = 4\sqrt{2} \approx 5.657$

Or you might have meant:

$\frac{12}{3\sqrt{2}} \\~\\ = \frac{4}{\sqrt{2}} \\~\\ = \frac{4\sqrt{2}}{2} \\~\\ = 2\sqrt{2} \approx 2.828$