A Turkey Is Removed from the Oven When Its Temperature $175 ^ { \circ } \mathrm { F }$

A turkey is removed from the oven when its temperature reaches $175 ^ { \circ } \mathrm { F }$ and is placed on a table in a room where the temperature is $70 ^ { \circ } \mathrm { F }$ . After 10 minutes the temperature of the turkey is 161 ${ } ^ { \circ } \mathrm { F }$ and after 20 minutes it is $149 ^ { \circ } \mathrm { F }$ . Use a linear approximation to predict the temperature of the turkey after 30 minutes.