Answer
$85.0^{\circ}F=302.6K$
Work Step by Step
1. Convert $^{\circ}F$ to $^{\circ}C$
$^{\circ}C$=$(^{\circ}F-32)/1.8$
=$(85.0^{\circ}F-32)/1.8$
=29.4 $^{\circ}C$
2. Convert $^{\circ}C$ to $K$
$^{\circ}C+273.15=K$
=$29.4^{\circ}C+273.15=302.6K$