$\lim_{x\to\:\:10}\left(\frac{\left(48\right)^{\left(x-10\right)}\:-1}{\:x-10}\right)$

$3n^2\cdot2n$

$\lim_{x\to\infty}\left(\frac{5^x}{125^{x-1}}\right)$

$-3\left(-4\right)$

$15-\left(2x-1\right)=8-\left(2-3x\right)$

$7x^{2}-9x+2$

$\int a\left(x+y\right)e^{-\left(x+y\right)}dx$