Question

The rate of change of the population of a city is proportional to the population P at any time t (in years). In 2000, the population was 200,000, and the constant of proportionality was 0.013. Estimate the population of the city in the year 2025.

Answer 1

276,806

Explanation:

In this context "rate of change of the population ... is proportional to the population" means it can be modeled by ...

P(t) = P0·e^(kt)

where "k" is the "constant of proportionality, and P0 is the population corresponding to t=0.

Filling in the given numbers, we have ...

P(25) = 200,000·e^(0.013·25) ≈ 276,806

The population is estimated to be 276,806 in the year 2025.