Final answer:
The best mathematical model to represent the depletion of a cell phone battery is exponential decay, as it captures the consistent percentage decrease in charge over time.
Step-by-step explanation:
For Zeke's science project that is studying the rate at which a cell phone battery depletes, the mathematical model that would best represent this study is exponential decay. Cell phone batteries tend to lose charge in a manner where the amount of charge decreases by a certain percentage over equal time intervals, which is a characteristic of an exponential decay process. Unlike linear growth or polynomial functions, exponential decay accurately describes situations where a quantity reduces by a consistent percentage rather than by a consistent amount or more complex polynomial rates.