Bo, 4.23 is not bigger than 4.3
Y = -15 is the answer and blah
This isn't the same problem but it's an idea. of what you're doing.
What are the instructions or equations to use
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
.
To know more about Fraction
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