Define the internal energy of the system

If the amount of heat given to a system be 35 joules and the amount of work done by the system be -15 joules , then the change in the internal energy of the system is

When work done by a system was 10J, the increase in the internal energy of the system was 30J. The heat 'q' supplied to the system was:

Heat given to a system is 30 joules and work done by the system is 15 joules. The change in the internal energy of the system will be

Heat given to a system is 35 joules and work done by the system is 15 joules. The change in the internal energy of the system will be

Heat given to a system is 35 joules and work done by the system is 15 joules. The change in the internal energy of the system will be

Define internal energy of a system .

What is internal energy of a system ?