Question

todays temperature is supposed to be 5°c warmer than yesterday. if yesterdays temperature was -10°c, what is todays temperature supposed to be?
○ 5°c
○ -15°c
○ 15°c
○ -5°c

Explanation:

Step1: Identify the formula

To find today's temperature, we add the increase in temperature to yesterday's temperature. The formula is: Today's temperature = Yesterday's temperature + Increase in temperature.

Step2: Substitute the values

Yesterday's temperature was \(-10^\circ C\) and the increase is \(5^\circ C\). So we calculate \(-10 + 5\).

Step3: Perform the calculation

\(-10 + 5 = -5\)? Wait, no, wait. Wait, the problem says today is 5°C warmer than yesterday. Wait, yesterday was -10°C. So -10 + 5? Wait, no, that would be -5? But wait, let's check again. Wait, maybe I misread. Wait, the options include -5°C? Wait, the options are 5°C, -15°C, 15°C, -5°C. Wait, no, wait: "5°C warmer than yesterday" means we add 5 to yesterday's temperature. Yesterday was -10°C. So -10 + 5 = -5? Wait, but let's check the calculation again. -10 + 5: when adding a positive to a negative, we subtract the absolute values and take the sign of the larger absolute value. The absolute value of -10 is 10, absolute value of 5 is 5. 10 - 5 = 5, and the sign is negative (since 10 > 5), so -5. Wait, but let's check the options. One of the options is -5°C. Wait, but let's re-express the problem. Wait, maybe I made a mistake. Wait, the problem says "5°C warmer than yesterday". So if yesterday was -10°C, then today is -10 + 5 = -5°C? Wait, but let's check the options. The options are: 5°C, -15°C, 15°C, -5°C. So the correct answer should be -5°C? Wait, no, wait, maybe I messed up the sign. Wait, warmer means higher temperature, so if yesterday was -10, adding 5 would be -10 + 5 = -5. Yes, that's correct. Wait, but let's confirm. Let's take an example: if yesterday was 0°C, and today is 5°C warmer, then today is 5°C. If yesterday was -5°C, today 5°C warmer is 0°C. So applying the same logic, yesterday -10°C, today is -10 + 5 = -5°C. So the correct option is -5°C. Wait, but let's check the calculation again. -10 + 5: 5 - 10 = -5. Yes, that's correct.

Answer:

\(-5^\circ C\) (corresponding to the option with \(-5^\circ C\))