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 -9e -0.2t degrees Fahrenheit per hour after t hours. The original temperature of the tap water was 60 degrees. (a) Find a formula for the temperature of water that has been in the freezer for t hours. T(t) = (b) When (in hours) will the ice be ready? (Water freezes at 32 degrees. Round your answer to the nearest hour.) t = hours

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