| linear_interpolate | Linear interpolation between start and end. Returns start + (end - start) × t for 0 ≤ t ≤ 1. |
| exponential_growth | Calculates exponential growth: initial × (1 + rate)^periods. |
| decay | Calculates exponential decay: initial × (1 - rate)^periods. Requires rate < 1 for meaningful results. |
| compound | Calculates compound interest. Formula: principal × (1 + rate/n)^(n×t)… |
| simple_interest | Calculates simple interest: principal × (1 + rate × time). |
| continuous_compound | Calculates continuously compounded interest: principal × e^(rate × time). |
| present_value | Calculates present value from future value. Formula: FV / (1 + rate)^periods |
| effective_annual_rate | Calculates effective annual rate from nominal rate. Formula: (1 + r/n)^n - 1 |