Question 1187254
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How this problem is worded / posed,  it contradicts to common sense, as well as to description of involved processes.



More concretely,   T(t)  is the temperature  OUT  the refrigerator,

while the formula  for   N(T)  works for the food  INSIDE  the refrigerator.



T H E R E F O R E,   considering the composition    N(T(t))   makes no sense.