Answer
$5$
Work Step by Step
if $n > 0\Rightarrow \lim _{x\rightarrow \infty }\dfrac {a}{x^{n}}=0\Rightarrow $
$$\lim _{x\rightarrow \infty }\left( 5+\dfrac {1}{x}+\dfrac {10}{x^{2}}\right) =5+0+0=5$$
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