Answer:
the temperature at 6pm was 12.8 F
Explanation:
Temperature every three hours...
9am: - 10.6
rose 14.2 so you add this to the starting temperature
9am - Noon: - 10.6 + 14.2 = 3.6
Noon: 3.6
went up 11 so you add this to the temperature at noon
Noon - 3pm: 3.6 + 11 = 14.6
3pm: 14.6
went down 1.8 so you subtract this to the temperature at 3pm
3pm - 6pm: 14.6 - 1.8
6pm: 12.8