Math problem

Question

In 2012 world population was 7.1 billion. Use a doubling time of 60 years to calculate the approximate world population in 2100. (Round to the nearest billion.)

Answer 1

f(t) = ab^t

 

f(88) = 7.1(2^1/60)⁸⁸

f(88) = 7.1(2^88/60)

f(88) = 7.1(2^1.47)

f(88) ≈ 7.1(2.77) 

f(88) ≈ 19.7

 

In 2100 the population shall be approximately 20 billion.