Answer
$T_f=56.5^{\circ}C$
Work Step by Step
As given that
$5.25cm=10.0^{\circ}F$
For $1cm=\frac{10.0^{\circ}F}{5.25cm}$
Now for $18.5cm$
$18.5cm=(18.5cm)\frac{10.0^{\circ}F}{5.25cm}=35.2^{\circ}F$
Thus $T_f=98.6+35.2=133.8^{\circ}F$
Finally, we convert this final temperature into centigrades
$T_f=\frac{5}{9}(133.8-32)=56.5^{\circ}C$
