exponential question please help

Question

Earth's population is approximately 6 billion people and is growing at an an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 40 years.

Answer 1

E = E₀(1.019)^t where E represents earth's present population, E₀ is the original population of Earth & t represents time

 

E(40) = 6(1.019)⁴⁰ = 6 * 2.12308 = 12.739 billion