The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system.

How much heat, in joules, is transferred into a system when its internal energy decreases by 155 J while it was performing 29 J of work?

184 J

Explanation:

So the first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system. Therefore, the heat transfer into the system when internal energy decreases by 155J while performing 29J of work is the sum of energy, which is

155 + 29 = 184 J

like poles repel so keep pushing north to north and repels funny to see this

reserve is the answer