A system does?1.40???108?J of work while?9.20???108?J of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)? (Include the sign of the value in your answer.)?
?Answer: _?J
I tried 7.8e8 and -7.8e8 and neither were right, please help!