The answer is 70 . if it is 75 or higher then it wold be rounded to 80
If ir means not, then irrational means not rational. Pi is and irrational number.
Answer:
$893.666 rounded to the nearest cent is $894.00
is conservative if there is a scalar function 
such that 
. This would require
(or perhaps the last partial derivative should be 4 to match up with the integral?)
From these equations we find
so 
is indeed conservative, and the gradient theorem (a.k.a. fundamental theorem of calculus for line integrals) applies. The value of the line integral depends only the endpoints:
