If the world population in 2010 was 7 billion and it is growing exponentially with growth constant 𝑘=1/20 ln(2) when time is measured in years, find the population (in billions) in the year 2090.

Answer 1

N₈₀ = 7(e)^80(ln2)/20)

N₈₀ ≈ 7(e)^2.77

N₈₀ ≈ 7(15.9586)