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The temperature went up from -4°C to 5°C
a) temperature rise = 5°C - (-4°C) = 5°C + 4°C = 9°C

b)During the afternoon the temperature then fell by 7°C from 5°C
temperature at the end of afternoon = 5
°C - 7°C = -2°C 
So temperature at the end of afternoon is -2°C. 
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