M2=5x+10
.................
Answer: Third option is correct.
Step-by-step explanation:
Since we have given that
There is a cyclic quadrilateral.
As we know that "Sum of opposite angles in a cyclic quadrilateral is supplementary.":
so, it becomes,

Hence, the measure of ∠1 = 94°
Therefore, Third option is correct.
Answer:
120 degrees the sum of all angle is 720 degrees In the above