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Answer:

14.

All sides of a rhombus are equal.

  • 9a - 18 = 3a + 15
  • 6a = 33
  • 3a = 16.5
  • VW = 16.5 + 15 = 31.5

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°

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