Mathematics, 22.08.2019 10:30 ayeelol1447

How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to function a(t)=750e^ -.119t, where t is the time in years? round your answer to the nearest hundredth year.
t equals i don't see the time anywhere! can someone me figure this mess out?

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