Research shows that the radioactive isotope Caesium- 137 has a half-life of 30.17 years Use the following to construct a function that will model the amount of Caesium-137 remaining after t years, from an initial amount of 15 kg. Q(t) = Pert Where Q(t) describes the amount of Caesium-137 remaining after t years from an initial quantity of P kg. 1. Q(t) = 2. How long (in years) will it take for the amount of Caesium-137 remaining to reach 4 kg?

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