Samuel spends a winter day recording the temperature once every three hours for science class. At 9 am, the temperature was -14.
7°F. Between 9am and noon, the temperature increased by 17.8°F. Between noon and 3pm, the temperature increased by 5.1°F. Between 3pm and 6pm, the temperature went down 14.5°F. What was the temperature at 6pm?