Answer
$ \approx$ 9.75 million dollars
Work Step by Step
$f(8) - f(4) = \int^{8}_{4} f'(t) dt $
$= \int ^{8} _{4} \sqrt{t} dt $
$= \frac{2}{3} (16\sqrt{2} - 8)$
$ \approx$ 9.75 million dollars
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