Answer: The correct answer is option A: 6
Step-by-step explanation: We shall start by splitting the word problem into bits to ease our calculations.
We start with “the quotient of a and 6...” and that can be expressed as
a/6 where a equals 186, this becomes
186/6 and this equals 31.
Note that quotient means the result derived from dividing two numbers/values.
Next, “The difference of ... and b squared”
The missing part of this statement has been calculated as 31, so this can now be written as “The difference of 31 and b squared” where b equals 5 and b squared now equals 25. Hence what we have is the difference of 31 and 25
That is, 31 - 25 and that equals 6.
Therefore, the expression can now be written out as;
(a/6) - b^2
When a equals 186 and b equals 5, the answer is 6
and 
, then the length is 
. The result is 
.