The function A = s^2 giving the area of a square as a function of its side length
Linear or Nonlinear:
Domain:
The function A = s^2 is a nonlinear function because it has a variable (s) raised to the power of 2, which makes it a quadratic function.
The domain of this function is all real numbers because the side length (s) of a square can be any positive or negative real number.