Posted by Carla on Sunday, December 19, 2010 at 11:15pm.
Tha average value of f is the integral of the function (over that [0,2] interval) divided by the interval width, 2.
I assume you know how to integrate the function. The value of the integral is
5/2*4 + 18 = 28 . The average value is therefre 28/2 = 14
Now find what value of x that makes
5x + 9 = 14. It is 1
That should not be a surprise. For a linear function, the average is the value in the middle of the interval.
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