I'll work on the first one soon....
Ans- is D) hope it helps you
The first one is right and the third one is right, but you need to switch the 15% and the 95%.
In #2, it's asking for the kids that <em>are not</em> Michael, so it'd be 18/19. Which is then rounded to roughly 95%.
#4 asks for 6/40 = 15%
I believe your answer is 5th degree polynomial.