By our convention in class work entering a system is and he

By our convention in class, work entering a system is __ and heat entering a system is __.(Positive: +, negative: -)

Solution

work entering a system means work done on the system is considered as negative

heat entering a system means heat supplied to the system is considered as positive

more information:

work done by the system is considered as positive

heat rejected by the system is considered as negative