(Solved): A thermometer is taken from a room where the temperature is 18C to the outdoors, where the tempe ...

A thermometer is taken from a room where the temperature is $18^{?}\mathrm{C}$ to the outdoors, where the temperature is $?9^{?}\mathrm{C}$. After one minute the thermometer reads $5^{?}\mathrm{C}$. (a) What will the reading on the thermometer be after 4 more minutes? (b) When will the thermometer read $?8^{?}C$ ? minutes after it was taken to the outdoors.