Damian spends a winter day recording the temperature once every three hours for science class. At 9 am, the temperature was -6°F
. Between 9am and noon, the temperature rose 1.9°F. Between noon and 3pm, the temperature went down 6.9°F. Between 3pm and 6pm, the temperature went down 11.1°F. What was the temperature at 6pm?
