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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.

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