Yes. The 100 - 85 = 15, meaning 15% of parents said yes. 85 > 15
2 and 5. 1 isn't apart of the list because the definition of a prime number is having 1 and itself as a factor. 1 only has the number 1.
-5 < 0
-6 < 0
-12 < 0
If you want to get really theoretical, think about imaginary numbers! Like 5i