Question

A population growing continuously at an annual rate r will triple in a time t given by the formula t=ln3/r. How long will it take the population of a town to triple if it's growing at the rate of 13% per year? It says to round the answer to one decimal place.

Answer 1

Replace r with 13% written as a decimal, and find the log and divide.
That will give you t.

Answer 2

thank you