#### Answer

$101.267354177^{o}$

#### Work Step by Step

Make sure that the setting for angles is "degrees".
$\sec^{-1}x$ is evaluated as $\displaystyle \cos^{-1}(\frac{1}{x})$
Keys:
"shift" or "2nd function"
"cos"
numerical keypad: (-1$\div$5.1180378)
"="
yields
$101.267354177^{o}$