Question

Pls answer this 7th question in full explanation​

Answer 1

80

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

`x + x + 20 = 180`

Combine Like Terms

`2x + 20 = 180`

Apply Basics Rules of Algebra

`2x = 160`

`x = 80`

This means angle A measure 80 degrees