**Answer:**

18. x = (?)

__x = 60°__ (Alternate angles)

19. y = (?)

(y + 35°) + (60° + 55°) = 180° (supplementary angles)

y + 150° = 180°

y = 180° – 150°

__y = 30°__

20. z = (?)

z = 180° – y – 55°

z = 180° – 30° – 55°

__z = 95°__

**Answer:**

18. x = (?)

__x = 60°__ (Alternate angles)

19. y = (?)

(y + 35°) + (60° + 55°) = 180° (supplementary angles)

y + 150° = 180°

y = 180° – 150°

__y = 30°__

20. z = (?)

z = 180° – y – 55°

z = 180° – 30° – 55°

__z = 95°__