# At the beginning of a laboratory experiment, the temperature of a substance is -12.6°C. During the experiment, the temperature of the substance decreases 7.5°C. What is the final temperature of the substance?

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At the beginning of a laboratory experiment, the temperature of a substance is -12.6°C. During the experiment, the temperature of the substance decreases 7.5°C. What is the final temperature of the substance?

2020-10-19
Subtract the initial temperature by the change, since it decreased: -12.6-7.5
To subtract, add the opposite: =-12.6+(-7.5) =-20.1
So, the final temperature is -20.1°C

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