Answer:
do u take links bcs i can give u a link to the answer if u want
To subtract vectors, you simply have to subtract correspondent coordinates.
So, if you have

the subtraction is simply

So, in your case, we have

Simply subtract 8.72 from 20.08 and you get the answer which is 11.36$
Answer: Yes; this is polynomial.
Specifically, it is a "polynomial EXPRESSION" ; but not a "polynomial equation" ; because it is not an "equation.
There are more than one variables/variable expressions, so it is a polynomial.