Determine whether each statement is sometimes, always or never true.
a. A function whose graph is a straight line has a
variable rate of change. always
b. A quadratic function has a constant rate of
change. never
c. The rate of change of a linear function is
negative. sometimes
d. The rate of change between two points on the
graph of a nonlinear function
is 0.

Answer choices- always, sometimes, never