Over the course of 4 hours, the temperature in Juneau. Alaska fluctuated immensely. The table below shows the change in temperature for each hour for the first three hours. hour/temperature
1 : +3
2: -12
3: +5
4: ?

If the temperature at the start was -9 degrees Fahrenheit and the ending temperature was -2 degrees Fahrenheit, how much did the temperature change during the fourth hour?