The average rate of change of a function over an interval [a, b] is given by the formula:
Average Rate of Change = (f(b) - f(a)) / (b - a)
For the interval 5 ≤ x ≤ 9, we have:
Substitute these values into the formula:
Average Rate of Change = (1215 - 15) / (9 - 5) = 1200 / 4 = 300
Therefore, the average rate of change is 300.
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