WeBWorK Standalone Renderer

For the following functions, enter E if they are even, O if they are odd, and N if they are neither even nor odd.

$f(x) = |x|$ .
$f(x) = 2$ .
$f(x) = \frac{x^3+x}{3+x^2}$ .
$f(x) = |x|x$ .

In order to get credit for this problem all answers must be correct.