- Optimization math problem?

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Calculate ΔE for the combustion of a gas that releases 215 kJ of energy to its surroundings and does 78.5 kJ of work on its surroundings.? Can you help with my Precalculus? Can you please explain this questions and list the steps that you did to get to the answers - there are two questions. Thank you? Is twelve noon am or pm and what time is twelve noon? Are rocks stones or are stones rocks?