Limit Quiz 4

$\mathop {\lim }\limits_{x \to \infty } \frac{{{x^5}}}{{{5^x}}}$
$\mathop {\lim }\limits_{x \to \infty } \frac{{{{(.8)}^x}}}{{{x^3} + x - 1}}$
$\mathop {\lim }\limits_{x \to \infty } \left( {\frac{{10{x^2}}}{{2{x^2} + 9}} + 3} \right)$
$\mathop {\lim }\limits_{y \to \infty } \frac{{y + 1}}{{{{(.8)}^y}}}$
$\mathop {\lim }\limits_{t \to \infty } \left( {\frac{{{4^t} + t}}{{{5^t} - 7}} + 3} \right)$
$\mathop {\lim }\limits_{m \to \infty } \frac{6}{{{{\left( {\frac{3}{5}} \right)}^m}}}$