Okay, 72 degrees is equal to (5x-98), so
72=5x-98
5x=170
x=34
So now that we know that x=34, we can put 34 into (5x-98), so 170-98
170-98 and y are supplementary, so they add up to 180 degrees. So the equation is
170-98+y=180
72+y=180
y=180-72
y=108
27.71 is the sum
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11,339,800 is 11,340,000 rounded to the nearest whole number