Algebra-1

The function is nonlinear because its graph is curved.

Here's why each option applies or doesn't apply:

A. "This is a nonlinear function because it goes down."

This statement refers to the general behavior of the graph (decreasing as x increases), but it does not directly indicate whether the function is linear or nonlinear. Many functions can go down or decrease without being nonlinear.

B. "This is a nonlinear function because it is vertical."

Verticality of a function's graph typically refers to a vertical line, which does not describe the nature of the function itself as linear or nonline...