An ice cube tray filled with tap water is placed in the freezer, and the temperature of the water is changing at the rate of  −10e−0.2t  degrees Fahrenheit per hour after t hours. The original temperature of the tap water was 75 degrees. (a) Find a formula for the temperature of water that has been in the freezer for t hours. T(t) =        (b) When will the ice be ready? (Water freezes at 32 degrees. Round your answer to the nearest hour.) t =  hr

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