2. 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 -12e^-0.2t degree fahrenheit per hour after t hours. The original temperature of the tap water was 70 degrees.
Questions:
a. Find a formula for the temperature of the water that has been in the freezer for t hours.
b. When will be the ice be ready? (Water freezed at 32 degrees)
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