2. a) Estimate the instantaneous rate of change of the function at the tangent point (7,9) indicated on the graph. 15 10 5 (7,9) 10 15 + 20 25 30 85 b) What is the significance of a positive rate of change of the function at the tangency point? c) Find the average rate of change of the function on interval [7,20]. What does the average rate of change represent?

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