If a temperature differs from normal by x° F it will be 73.9° F ± x° F.
A mod function is defined as |x|= a which is x = a or - x = - a.
According to the given question a normal temperature for a certain animal is 73.9 F if a temperature x that differs from the normal it can be
73.9° F + x° F or 73.9° F - x° F which is
73.9° F ± x° F.
Because rise of temperature and fall of temperature is a temperature difference that differs from the normal temperature.
learn more about modulus function here :
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