Answer:
A: Nonlinear; B: Linear; C: Nonlinear; D: Linear; E: Nonlinear
Step-by-step explanation:
In order for a function to be linear, the power of the variable x must be 1.
In function A, the power of x is 3; this makes the function cubic, not linear.
In function B, the power of x is 1; this makes the function linear.
In function C, the power of x is 2; this makes the function nonlinear.
In function D, the power of x is 1; this makes the function linear.
In function E, the power of x is 2; this makes the function nonlinear.