The two.
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When using significant digits, the product has only the number of significant digits as the lowest number in the factors. "20" has two significant digits and "310" has three. Therefore, the product has to have two significant digits. 310 × 20 = 6200 6200 already has two significant digits.
20 degree Celsius = 68 degree Fahrenheit
Two. The decimal indicates that the zero is significant otherwise it wouldn't be a significant digit.
You just say "degree" followed by the temperature scale, for example, "It was 20 degrees Celsius".
-20 degree Celsius = -4 degree Fahrenheit.Conversion to Fahrenheit: -4°F