Because heat can either be hot which is positive, or cold which is negative. Hot and cold are relative terms which means it is a comparison to another temperature.
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it's only negative if it's being multiplied by a positive number. If it's being multiplied by another negative number than it will be positive.
yes
sometimes
In multiplication and division: always. In addition: never. In subtraction: sometimes.
Negative * positive = negative Positive * positive = positive Negative * negative = positive