Question

answer is -40
but how​

Answer 1

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At this temperature the value on the celcius scale is equal to the value on the Farenheit scale of temperature.

Place C = F and you will get this value

Answer 2

Step-by-step explanation:

At this temperature the value on the celcius scale is equal to the value on the Farenheit scale of temperature.

Place C = F and you will get this value