Explanation:
Basically, you're given angle N and the length of line MO.
It's asking us to look for the hypotenuse.
Since we're given the opposite and are looking for the hypotenuse, we would have to use the sine ratio to figure out x.
8 / sin 30 = 16
You can also use the tangent ratio and look for the adjacent and then use pythagorean to find the hypotenuse.
8 / tan 30 = 13.85......
13.85....² + 8² = 256
Square root of 256 = 16