Respuesta :

The total amount that all the angles inside the triangle equal is 180°. 
So you can write an equation with the given
3x+5 + 2x+18 + 2x+17 = 180
Combine all like terms
7x + 40 = 180 
subtract 40 from both sides
7x = 140 
divide both sides by 7
x = 20 

Then you plug that into the angles and find out how much each is

3x + 5
3(20) + 5
60 + 5
65

2x + 18
2(20) + 18
40 + 18
58

2x + 17
2(20) + 17
40 + 17
57

Hope this helps :)

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