# Algebra 2 help...

A half life of a certain radioactive is 36 days. An initial amount of the material has a mass of 487 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the nearest thousandth.

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1. amount = 487 (1/2)^(t/36) where t is the number of days.

if t = 5
amount = 487(.5)^(5/36)
= 442.302 kg

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