ANSWER
26 degrees
Step-by-step explanation
Supplementary angles are angles which add up to 180 degrees.
This means that if we add two angles that are supplementary, we will get 180 degrees.
A and B are supplementary angles.
We have that:
A = (x - 16)
B = (3x + 28)
Therefore:
A + B = 180
x - 16 + 3x + 28 = 180
Collect like terms and simplify:
4x + 12 = 180
4x = 180 - 12 = 168
=> x = 168 / 4
x = 42 degrees
This means that:
A = x - 16 = 42 - 16
A = 26 degrees