Answer:
1. a. x= 18°
sum of interior angles is = 180°, so, to get x, = 2.5x + 4.5x + 3x = 180°
2.5x = 45
4.5x = 81
3x = 54
2. a. x = 75°
x - 10 = 65
x-35 = 40
x = 75
use the concept in number one.
3. a. x = 25
the two opposite interior angles add up to the exterior angle . so,
4x + 55 = x + 130
like terms together then simplify to get x as 25
so 4x = 100°
x + 130 = 155°
4. ∠2 = 180 - (38+34) = 108°
∠5 = 180 - (38+74) = 68°
∠6 = 74 + 38 = 112°
hope you understand now.