can someone correct these also for me..

Which of the following is not a polynomial?
a) 24
b) 4x^3+5x-1
c)2x-(1)/(x)
d)3xy^2+xy

MY answer is: A

Simplify. write your answer with only positive exponents

(y^5)/(y^10)

Possible answers:
a)y^2
b)(1)/(y^2)
c)(1)/(y^5)
d) y^5
My answer: c

all correct.

excellent....thank you bobpursley