You need to use the mean value theorem for the function `f(x) = sqrt(20-x)` , over the interval `[-5,20` ] such that:

`f(20) - f(-5) = f'(c)(20 - (-5))`

You need to remember that `c in (-5,20)` and you need to evaluate `f'(x), ` then you need to substitute c for x in equation representing `f'(x) ` such that:

`f'(x) =...

(The entire section contains 167 words.)

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