Answer:
80
Step-by-step explanation:
Objective: Supplementary Angles.
Supplementary Angles are Angles that add up to 180.
In the problem, Two angles add up to 180. We don't know Angle A and we know Angle B.
Let set up the equation
Let x represent the measure of Angle A and x+20 represent the measure of Angle B
[tex]x + x + 20 = 180[/tex]
Combine Like Terms
[tex]2x + 20 = 180[/tex]
Apply Basics Rules of Algebra
[tex]2x = 160[/tex]
[tex]x = 80[/tex]
This means angle A measure 80 degrees
