$\lim_{x\to-4}\left(\frac{x^4-2x^3-19x^2+32x+48}{x^2-16}\right)$

$\lim_{x\to-4}\left(\frac{-x^2-10x}{x+4}\right)$

$\frac{1000x^9+216y^9}{10x^3+6y^3}$

$\int\frac{t}{t^2+9}dt$

$\int\left(\frac{x^2}{3}-x+3\right)\left(\frac{1}{x}\right)dx$

$m^3+10m^2+2m-13$

$\frac{8}{3}x+9\le-12x+6$