Write the key combination you need to in order to enter the following numbers and then answer:

$ln723$

$ln2\mathrm{.}671{10}^{-4}$

$-ln1\mathrm{.}8{10}^{-5}$

Inverse natural $log(e)$ :

Write the key combination you need to in order to enter the following numbers and then answer:

$e^{3\mathrm{.}91}$

$e^{\frac{-514}{8314}}$

$e^{-7\mathrm{.}84}$