This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: After a container of ice cream has been sitting in a room for t minutes, its temperature in degrees Fahrenheit is a - b2^{-t} + b, where $a$ and $b$ ar...

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