According to me this is the best solution I can think of


#1

Answer is C because n^3/sqrt(n) is equivalent to n^3/n^0.5 which is equal to n^2.5 ,which is greater than prefer of n^2 .
All of the other option is less than order of n^2:
A : linear
B : n^1.98
D : linear


#2

Yup, I agree. This is what I though of.