Answer
$113^{\mathrm{o}}~\mathrm{F}$
Work Step by Step
In order to convert Celsius to Fahrenheit, we use the formula:
$F=\displaystyle \frac{9}{5}C+32$
We plug in $45$ for C:
$F=\displaystyle \frac{9}{5}(45)+32$
$=81+32$
$=113^{\mathrm{o}}~\mathrm{F}$