$-15+37-\left(-5\right)+9$
$\lim_{x\to4}\left(\frac{2x^2-8x}{x^2-16}\right)$
$\frac{x^2+1}{\left(2x+3\right)\left(x^2+2x+2\right)}$
$\sqrt[5]{\frac{-64s^9t^{10}}{243s^{25}}}$
$2x+2^2$
$\left(2z-\frac{1}{z}\right)^2$
$\sqrt{64}+\sqrt{196}-\sqrt{25}-\sqrt{4}$
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