Nonlinear Functions

SAT Math· difficulty 5/5

A radioactive substance with half-life 10 years has 200 g now. When will only 50 g remain?

  • A

    2020 years

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  • B

    1515 years

  • C

    2525 years

  • D

    1010 years

Explanation

50/200=1/4=(1/2)250/200 = 1/4 = (1/2)^2, so 2 half-lives = 20 years.

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