The answer is C. 100 because the total measure of a quadrilateral is 360. When you add up the 3 interior angle measures, it adds up to 260. Then you subtract 360-260 to get 100 as the fourth angle measure. Hope that this helped!
1) 12
2) 2y
3) 12+2y
4) 12+2y
Answer:

Step-by-step explanation:




Seven and five because seven times five is thirty five and seven minus five is two