Answer: 26.5
Step-by-step explanation:
You can turn the second half of the shape into a right triangle, which has 180 degrees. With the right angle, you can set the two angles up to 90 degrees.
x + (3x-16) = 90
4x - 16 = 90
+ 16 + 16
4x = 106
/ 4 / 4
x = 26.5
