Question

In 2010, the world's population reached 6.91 billion and was increasing at a rate of 1.1% per year. Assume that this growth rate remains constant. (In fact, the growth rate has decreased since 1987.) (a) Write a formula for the world population (in billions) P as a function of the number of years t since 2010.

Answer 1

\[P(t) = 6.91 \times 1.011^t\]