Answer:
Step-by-step explanation:
The lower left angle of the triangle is vertically opposite to 4x + 17. Therefore the third angle of the triangle is also 4x + 17.
x + 23 + 4x + 17 + 80 = 180 All triangles have 180o
5x + 40 + 80 = 180 Collect like terms
5x + 120 = 180 Subtract 120 from both sides
- 120 -120
5x = 60 Divide by5
5x/5 = 60/5
x = 12
But you are asked for Angle A
A = x + 23
A = 12 + 23
A = 35
