From a set of observations

MATHEMATICS · Subjective · A Level · Mathematics · Exponentials and logarithms · Exponentials and logarithms

Problem

From a set of observations, a best-fit line for

\ln N

versus time

t

(in years) is

\ln N = 3.40 + 0.092\,t

. According to this model, how many years will it take for

N

to become four times its initial value? Round to the nearest tenth of a year.