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[versed harbor]

What part is causing u a problem??

What class r u in?

For the 2nd question
(1)- angle b + angle a + angle POY is making a straight line so it is equal to 180°

(2)- angle AOC + angle Y = 180 °
And
Angle Y + Angle DOB = 180°
So Angle AOC = Angle DOB
We also call them vertically opposite angles
Angle Y = 100°
Angle DOB = 80°

(3)- Angle A + Angle B = 90°
Their ratio is 2:3
So we can write
2x + 3x = 90
5x = 90
x = 18°
Angle A = 2x = 36°
Angle B = 3x = 54°