Precalc help please review can you explain this?

The number of bacteria in a refrigerated food product is given by N(T)=24T2−76T+15, 3T33 where T is the temperature of the food.
When the food is removed from the refrigerator, the temperature is given by T(t)=6t+13 , where t is the time in hours.
Find the composite function N(T(t)):
N(T(t))=
Find the time when the bacteria count reaches 4580
Time Needed =

3 minutes and 42 seconds

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