The angle to the right of the one that equals 112 is 68 because they're supplementary. The one under 73 is 107 because they're supplementary as well. The angle under 85 is 95, because once again, they're supplementary. A quadrilateral is 360 degrees no matter what. Add 68+85+107. Take the answer and subtract that from 360 to get the final angle of your quadrilateral. Then subtract that number from 180 to get x