Answer: x = 111
Explanation: To find the missing angle, you first have to find the sun of the known angles.
75 + 36 = 111
From there you subtract it from 180, because the sun of all angles in a triangle add up to 180 degrees.
180 - 111 = 69
From there, you have the interior angle. The angle you are looking for is equal to the number you had originally found, 111.
