What are the change in internal energy if 250 j of hear is added to a system of 80 j of work is done by the system

dU = dq+w

dU is change in internal energy of the system

dq is the amount heat added or released by the system which be positive or negative respectivelý

And w is the amount of work done by the system or on the system which will be positive or negative respectively.

Hence,

dU = 250+80 = 330 J

The change will be positive