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A substance experiences rapid changes in temperature over the course of an experiment to test its electrical conductivity.
At the start of the experiment the substance is measured to be 70°C, and by the end of the experiment its temperature is measured as −60°C.

Respuesta :

NotJolene

Answer:

130

Step-by-step explanation:

when u you have to subtract you do keep, change, change so it would 70 + 60 instead of 70 - (-60)

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