Step-by-step explanation:
x=90°
SUM OF ALL ANGLES OF PENTAGON =540
90+2(180-Y)+105+113=540
90+360-2Y+105+113=540
488-2Y=540
No the answer is not always postive. For example. If you had -50 and subtracted -30 you would have -20.
Changing from negative to positive
The answer for this solution is D
-3 and b