The temperature on a certain morning is -11℃ at 5 a. m. If the temperature drops 3 degrees at 6 a.m. and rises 5 degrees at 8 a.m. and again drops 3 degrees at 9 a.m. What is the temperature at 9 a.m.?
I NOT KNOWN
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-11 - 3 + 5 - 3 = ___
To find the temperature at 9 a.m., we need to start with the temperature at 5 a.m. and account for the changes that occurred between 5 a.m. and 9 a.m. Let's break it down step by step:
1. Start with the initial temperature at 5 a.m., which is -11℃.
2. At 6 a.m., the temperature drops 3 degrees. So, subtract 3 from the initial temperature: -11℃ - 3℃ = -14℃.
3. At 8 a.m., the temperature rises 5 degrees. So, add 5 to the previous temperature: -14℃ + 5℃ = -9℃.
4. At 9 a.m., the temperature drops 3 degrees again. So, subtract 3 from the temperature at 8 a.m.: -9℃ - 3℃ = -12℃.
Therefore, the temperature at 9 a.m. is -12℃.