Physics

Convert -40°F to the Celsius scale.

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°C = $\dfrac{\text{5}}{\text{9}}$ (F - 32)

= $\dfrac{\text{5}}{\text{9}}$ (-40 - 32)

= $\dfrac{\text{5}}{\text{9}}$ x (-72)

= - 40

So -40°F = -40°C.

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