Competition problem — Algebra — Maths Olympiad Prep

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Algebra Difficulty 2.8 Junior Find the answer

If the temperature rises by $1^{\circ}\mathrm{C}$ , it is denoted as $+1^{\circ}\mathrm{C}$ . Then if the temperature decreases by $2^{\circ}\mathrm{C}$ , it is denoted as

Pick one

Solution

To solve this problem, we follow the logic provided in the question and solution:

1. A temperature increase is denoted with a positive sign. For example, a rise of $1^{\circ}\mathrm{C}$ is represented as $+1^{\circ}\mathrm{C}$ .
2. Following this logic, a temperature decrease should be denoted with a negative sign.
3. Therefore, if the temperature decreases by $2^{\circ}\mathrm{C}$ , it should be represented as $-2^{\circ}\mathrm{C}$ .

Based on these steps, the correct answer is encapsulated as $\boxed{\text{A}}$ .

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Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic and difficulty added by this site.