Consider the following function. \( f(x) = -x^2 - 18x - 1 \) Find its average rate of change over the interval \([-9, 1]\). \[ \frac{\Delta y}{\Delta x} = \boxed{\phantom{0}} \] Compare this rate with the instantaneous rates of change at the endpoints of the interval. \[ f'(-9) = \boxed{\phantom{0}} \] \[ f'(1) = \boxed{\phantom{0}} \]

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