Answer:
13
Explanation:
The average rate of change of a function f(x) in the closed interval [ a, b ] is
here [ a, b ] = [ 3, 9 ]
f(b) = f(9) = 9² + 9 - 6 = 84
f(a) = f(3) = 3² + 3 - 6 = 6
average rate of change = = = 13
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