The equation for working out the temperature in fahrenheit from celsius is f = 9c/5 + 32
In other words, you multiply by slightly less than two, and then add more on. Therefore for many temperatures, just doubling would be a good approximation. Indeed, when the temperature is 160celsius, doubling would be correct.
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yes
Body temperature is about 98oF or 36oC, so 71oF would not be too good a temperature for lukewarm water, it would be too cool but 71 ºC would be way to warm.
near zero
Yes - that is a very good approximation. A mile is about 1.6 kilometers.
Approx: 6*20 = 120 Fact: 5.7*19.4 = 110.58