eayalaza eayalaza

25-11-2020
Mathematics

contestada

please help lol.. i have to find the value of x..

please help lol i have to find the value of x class=

Respuesta :

zarampa zarampa

25-11-2020

Answer:

x = 31

Step-by-step explanation:

The sum of the internal angles = 180°

then:

2x-5 + x+10 + 2x+20 = 180

5x + 25 = 180

5x = 180 - 25

5x = 155

x = 155/5

x = 31

Check:

2*31 - 5 + 31+10 + 2*31 + 20 = 180

62-5 + 41 + 62+20 = 180

57 + 41 + 82 = 180

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