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A cup of coffee is heated in a microwave oven to a temperature of 65C. It is extracted and exposed to the environment that is

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A cup of coffee is heated in a microwave oven to a temperature of 65C. It is extracted and exposed to the environment that is at a temperature of 21C. For practical purposes it can be assumed that in the first 8 minutes the temperature of the coffee cup decreases uniformly at the rate of 3.5 degrees Celsius per minute.

a) Build the function that allows you to predict the temperature T for different values of time t measured in minutes.

b) How many minutes should you wait from your extraction from the oven to drink the coffee at a temperature of 40 degrees Celsius?

c) We consider this linear model working longer. What temperature does the coffee reach after 15 minutes? Is this possible?

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Una taza de cafe se calienta en un horno de micro- ondas alcanzando una temperatura de 65 .C. Se extrae y se expone al medio ambiente que se en- cuentra a una temperatura de 21 .C. Para fines practicos se puede suponer que en los primeros 8 minutos la temperatura de la taza de cafe disminuye uniformemente a razon de 3.5 grados centigrados por minuto. a) Construye la funcion que permite predecir la tem- peratura 7 para diferentes valores del tiempo medido en minutos. b) Cuantos minutos se debera esperar a partir de su extraccion del horno para beber el cafe a una tem- peratura de 40 grados centigrados? c) Si consideramos este modelo lineal funcionando por mas tiempo Que temperatura alcanza el cafe a los 15 minutos? _Es esto posible

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