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An exponential function can have negative y-values. However, a real-world exponential decay model will never have negative values. Think of it this way... If you divide a positive number by 2 (or take half of it) and then divide that next number by 2, you will never reach or go below 0. For Example: 20, 10, 5, 2.5, 1.25, 0.625, 0.3125, etc. (Each number is half of the number before it.)
An exponential decay function describes a process where a quantity decreases at a rate proportional to its current value, leading to a consistent halving time. This means that after each fixed interval, the quantity reduces to half of its previous amount. For example, in radioactive decay, the halving time remains constant regardless of how much of the substance is left, illustrating the characteristic nature of exponential decay. Overall, it models many real-world phenomena where resources diminish over time.
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The X Factor usually runs for about 3 - 3 and a half months. September through to Decemeber. Bagshad :)