Answer:
14.
All sides of a rhombus are equal.
- 9a - 18 = 3a + 15
- 6a = 33
- 3a = 16.5
15.
- Diagonal of a rhombus are perpendicular to each other.
- Diagonals are angle bisectors.
- Adjacent angles are supplementary.
- m∠XZW = 10b - 5
- 10b - 5 = 90
- 10b = 95
- b = 9.5
- m∠WVY = 4b + 10 = 4*9.5 + 10 = 48°
- m∠VWX = 180° - 48° = 132°
- m∠WYX = 1/2m∠VWX = 1/2(132°) = 66°