# Math

posted by .

The doubling time of a city's population is 17 years. How long does it take for the population to quadruple?

• Math -

as long as it takes to double twice: 34 years

• Math -

How did you get that?

• Math -

come on, man. quadrupling means doubling twice. Each doubling takes 17 years.

after 17 years, the initial population P has grown to 2P

after 17 more years, the population 2P has grown to 2(2P) = 4P, and is quadruple the initial population of P.

## Similar Questions

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)?
2. ### POPULATION

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)?
3. ### Calculus

The population of a region is growing exponentially. There were 40 million people in 1980 (when t=0) and 50 million people in 1990. Find an exponential model for the population (in millions of people) at any time t, in years after …

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)?
5. ### MATH

If a population consists of ten thousand individuals at time t=0 (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15, and a 100 years (n)?
6. ### Math

If the doubling time of a state's population is 42 years, how long does it take for the population to increase by a factor of 16?
7. ### Population growth

The population P of a particular city, Metropia, is growing at a rate proportional to the current population. The population at time t years is modelled by the equation P = Aekt where A and k are constants. (a) With the aid of appropriate …
8. ### math

the population of a town is declining at a rate of 4.1% per year. the current population is 25000. 1)what will the population be in 7 years. 2) how long will it take the population to reach 15000?
9. ### Math

Initial population of a town is 18,691 and it has a doubling time of 15 years. What will the population be in 4 years?
10. ### Calculus

The rate of growth of a particular population is given by dP/dt=50t^2-100t^3/2 where P is the population size and t is the time in years. The initial population is 25,000. Find the population function. Estimate how many years it will …

More Similar Questions