Answers:
1 a) Angle 4 = 110° because vertically opposite angles are equal
b) Angle 7 = 70° because it is a corresponding angle to angle 3. (in an F shape)
c) Angle 3 = 70° because angle 4 is 110° so angles on a straight line add up to 180° (180-110 = 70°)
For question 2 I am using the first pair ( a = 50° and y = 110° )
2 a) 180 - 110 = 70° so B = 70°
b) angles in a triangle add up 180 so angle B (70°) + angle A (50°) = 120°
180-120=60 Therefore C is 60°