Answer: The internal energy of the system would increase by 21 J.
Explanation: Heat was removed from the system, so Q is negative. Also, work was done on the system. So ΔW is also negative.
Q = ΔU + ΔW
ΔU = Q – ΔW
ΔU = -29 – (-50)
ΔU = 21 J
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