a and b are parallel because 114 = 66+48 = 114, these two angles are the same because they are alternate exterior angles, and they couldn't be the same if a and b are not parallel.
Just divide 4.5 by 2.8 and you'll get the rate of decreasing degree per hour.
The answer is 42 bc I really do not know trying to get points!
I think your right,It would be 81.6.
Hope this helps. :D