Answer:
your answer is 453
Step-by-step explanation:
My best interpretation of the math here is that you're talking about the line integral,

I won't bother trying to decipher what look like multiple choice solutions.
By Green's theorem, the line integral above is equivalent to

where D is the set

Compute the double integral:

1.13 kilo. 1 kilo per 1,000 grams
Answer:
it is because 20 + 20 is 40 and then 40 - 20 = 20