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?

This is the formula to find the amt. A of that radioactive substance after time t.



We want to find out low long it will take for A to become half of its original amount.
We don't know the original amount, and the substance is not decaying at a constant rate (but rather an exponential one) so we can't answer that question.

Is there any information you forgot to give? Double check yourself.

The equation is y=17(7)+600 and it equals 717