Answer:

Step-by-step explanation:
Combining like-terms gives us 
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Answer:
The supplement is = 180-150 i.e30
The value of y will be equal to 4.
Reason : The length of the opposite cord is equal and therefore the distance from the centre to the cord will be equal.
Ans: 3rd option (4)
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It means that value is not counted. it’s there but you don’t include it