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rewona [7]
4 years ago
5

Plz help me i dont get it

Mathematics
1 answer:
Lesechka [4]4 years ago
3 0

Answer:

  11. 50 +2x+30 +2x+20 +x = 360

  12. x=52

  13. 134°

Step-by-step explanation:

The figure is a quadrilateral, so the sum of the angle measures is 360°.

11. An equation can be written based on this fact.

  50 + (2x+30) +(2x+20) +(x) = 360

__

12. We can solve in the usual way: simplify, subtract the left-side constant, divide by the coefficient of x.

  5x+100 = 360

  5x = 260

  x = 52

__

13. Then the value of 2x+30 is ...

  (2x+30)° = (2(52)+30)° = 134°

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