Answer
$-\dfrac {1}{8}$
Work Step by Step
$\lim _{s\rightarrow 16}\dfrac {4-\sqrt {s}}{s-16}=\dfrac {-\left( \sqrt {s}-4\right) }{\left( \sqrt {s}-4\right) \left( \sqrt {s}+4\right) }=-\dfrac {1}{\sqrt {s}+4}=-\dfrac {1}{8}$
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