4. Derivative Concepts: What is a derivative function?
a. It is the inverse of the original function.
b. It is the original function with only a positive domain.
c. It models the slope, or instantaneous rate of change, at every point of the function.
d. None of these.
5. Which is the correct vertex of the function $f(x) = -2x^2 - 4x + 1$ and is it a maximum or a minimum for the function?
a. minimum at $(-1, 3)$
b. minimum at $(3, -1)$
c. maximum at $(-1, 3)$
d. maximum at $(3, -1)$
