Question

Please Help me someone! I dont even know where to start. Solve for X

Answer 1

There is actually a cool trick to this. When you see a and 2a, in this case 6 and 12, then the small triangle is a 60-30-90 triangle. The remaining side is $6 \sqrt{3}$. 

This value rounds down to 10, and yep, you guessed it, another 30-60-90. 
This time, x = $10 \sqrt{3}$.

This is a very difficult problem and requires knowledge of the special triangles. Hope this helps!