Classify each function as Even, Odd, or Neither.

(a) $\small{f_1(x) = x^{3}}$
? Even Odd Neither

(b) $\small{f_2(x) = \left|x\right|}$
? Even Odd Neither

(c) $\small{f_3(x) = x+1}$
? Even Odd Neither

(d) $\small{f_4(x) =} \large{\frac{x^{5}-4x}{x^{2}+2}}$
? Even Odd Neither

(e) $\small{f_5(x) = 5}$
? Even Odd Neither