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The temperature at a mountain base camp was −3 degrees Celsius on Monday. Tuesday morning, the temperature was 2 degrees Celsius lower than it was on Monday. By Tuesday evening, the temperature was 4 degrees Celsius lower than it was that morning. What was the temperature at the base camp Tuesday evening? -9 degrees Celsius −6 degrees Celsius −5 degrees Celsius −1 degrees Celsius

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hcpsengstrobm

-9 degrees Celsius

because when the temp is negative it and it keeps going down, then the numbers basically get added and have a negative sign in front of it.

-3 +-2 +-4 = -9

It would be, negative nine.

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