# 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?

At the beginning of a laboratory experiment, the temperature of a substance is $-{12.6}^{\circ }C$. During the experiment, the temperature of the substance decreases ${7.5}^{\circ }C$. What is the final temperature of the substance?

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svartmaleJ

Subtract the initial temperature by the change, since it decreased: $-12.6-7.5$
To subtract, add the opposite: $=-12.6+\left(-7.5\right)=-20.1$
So, the final temperature is $-{20.1}^{\circ }C$