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- 20 °C is equal to -4 °F

To convert C to F, you use this formula, 1.8*C + 32 = F

So if C = -20, we have,

1.8*(-20) + 32 = F

(-36) + 32 = F

(-4) = F

-4

-40 Celsius is -40 F. The formula is 9./5 C + 32=F

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9y ago

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