In the diagram, what is the measure of angle 1? (image below)
A. 15°
B. 45°
C. 135°
D. 125°

T he answer is B 45 degrees
explanation
set up an equation
3x + 9x = 180
solve for x
x = 180/12 = 15
so, the angle 9x is 135 degrees
angle 1 is supplementary so, :
<1 = 180 - 135 = 45