1 answer:
(10 + 3x)° + (x - 30)° = 180°
(3x + x)° + (10 - 30)° = 180°
4x° - 20° = 180°
4x° = 180° + 20°
4x° = 200°
x° = 200/4
x° = <u>50°</u>
So, the value of x is 50°
<em>Hope it helps and is useful</em><em> </em><em>:</em><em>)</em>
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