3. An object at 50°F is put in an environment where the temperature is 100° F . After 5 minutes the temperature of the object reaches 60° F . a) Let T represent the temperature of the object after t minutes. Write a differential equation to model this situation. ( Hint study Newton's Law of cooling application in your textbook) b) Solve the differential equation c) Find the temperature of the object after 20 minutes.

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