The weight in kilograms,W, of a female African elephant at age t years is given by W(t)=2600(1-0.51e^-0.075t). Estimate the age, to the nearest year, of an adult female African elephant weighing 1800 kilograms. Ans: Substituting for Weight as 1800 in the equation, we getSimplifying Taking natural logarithms of both sides So age of the elephant rounded off to nearest year is 7 years. Hope you got it :)