It is -8 degrees.
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The temperature was zero at noon.
8+-8=0 Very Simple... -8 is eight below zero. 8 (+8) is eight more than zero
-8 deg C = 17.6 deg F.
Such a fraction need not exist. Consider, the measures of temperature:0 deg Celsius = 32 deg Fahrenheit. The fraction is 0/32 = 0.5 deg C = 41 deg F so the fraction is 5/40 = 1/8.-17.77... deg C = 0 deg F and the fraction is not defined!Such a fraction makes sense only if both measurements are on a ratio scale. If that is the case then - and only then - the fraction is a conversion factor.
Undefined: You cannot divide by zero