ANSWER CORRECTLY FOR BRAINLIEST U=Q-W

Note: if thermal energy is lost by a system or if work is done to a system q or w need to be negative

if thermal energy is added to a system or if work is done by a system q and w will be positive

200J of thermal energy are added to a system, 50J of work are done to the system, Later, 75J of thermal energy are lost by a system and 50J of work are done by a system. what is the change of internal energy of the system.