Are the following functions even, odd, or neither?

1. $y = x^{1/3}$

   Hint (a):

   Step 1(a):

   $\text{First, check if it is even:}$

   $f(a)=a^{\frac{1}{3}}$

   $f(-a)=(-a)^{\frac{1}{3}}=-a^{\frac{1}{3}}$

   $\text{since }f(a) \neq f(-a),$

   $f(x)\text{ IS NOT EVEN!}$

   Step 2(a);

   $\text{Next, check if it is odd:}$

   $f(-a)=(-a)^{\frac{1}{3}}=-a^{\frac{1}{3}}$

   $-f(a)=-a^{\frac{1}{3}}$

   $\text{since }f(-a)= -f(a),{\ \ \ \ \ }f(x)\text{ IS ODD!}$

2. $y = −x^2 + 4$

   Hint (b):

   Refer to the example in part (a). Be sure to simplify.

3. $y = x^3 + x^2 + 1$

   Hint (c):

   Refer to the example in part (a). Be sure to simplify.