I would think 32 so yea....because (12/98=49<33>**+{45-63-12{45+58-28} =32
The best estimate of the sum of the expression given is 
What is a Fraction ?
A fraction is written as p/q , where q
0
It is asked to determine the sum of the fraction
31/4 + 17/3 + 8/18
Taking the LCM of 4 , 3 , 18
LCM of 4 , 3 ,18 is 36
Therefore

(279+204+16) /36
499 / 36

Therefore the best estimate of the sum of the expression given is
.
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9/14 the anwser its really easy but i understand
2^2+b^2=12^2
4+b^2=144
144-4=140
√140 = √b
11.83 = b