This looks like a deformed pentagon anyways angle sum of pentagon 540
so u just to minus everything off 540
540-121-100-108-102
=109
There will be 7.45 centimeters of rain fell during each hour.
-8 3/8 = -8 15/40
-12 4/5 = -12 32/40 ,because you had to get a common denominator.
Since you are subtracting from a negative the negative turns into a positive.
-8 15/40 + 12 32/40 = 4 17/40