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Answer: x= 20 degrees [ option c ]
Step-by-step explanation:
On a straight line the angle is 180 degrees.
Angle between 3x+10 and 90 is x ----[ vertically opposite angles]
So x + 3x + 10 + 90 = 180
4x + 100 = 180
4x = 80
x = 20 degrees.
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