Answer:
174
Explanation:
There are many ways to see this question/how to answer it.
One way to go about it is to notice that based on the fact that 24 is already taking up 24/180 of the plane, you can do 180-24 to which that equals to 156.
And since the 156 degree angle is on the same side as x-18, you then set up your linear equation that quickly.
The equation is:
156=x-18
+18 | +18
174=x