Answer: 30
Step-by-step explanation: First of all, you need to know that the angle at hand is a right angle which measures up to 90 degrees. Knowing this, subtracting 90-30 will give you the result of 60 which is the measure of the unknown angle. Now, you know that 60=2x, so divide both sides by 2 and you get 30=x.
Also, this isn't part of the answer, but can you tell me how you added the pic?