Respuesta :

Answer:

D

Step-by-step explanation:

I did the test
  • ➡30 is correct answer
  • ➡option b is correct

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since we know on straight line 180° is formed

then

➡90° +(x+x+x)= 180°

➡90° + 3x = 180°

➡3x= 180°-90°

➡3x= 90°

➡x = 90°/3= 30°

➡x= 30°

then in triangle sum of all angles = 180°

➡90°+x+y = 180°

➡90°+ 30° +y = 180°

➡120+y = 180°

➡y= 180°-120°

y = 60

  • now to find y-x = 60°-30°=30

➡30 is correct answer

➡option b is correct

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