Exponential functions... Can someone help me solve this?
A radioactive substance decays so much that the amount present t days from now is #346(1/2) ^(t/15)# . What is the half life of the substance?
A radioactive substance decays so much that the amount present t days from now is
1 Answer
Apr 29, 2018
15 days
Explanation:
The half life is the point where we have 1/2 of the substance left from the beginning.
So what do we have at the beginning? Let's plug in
Now, we want something to be half of that, so let's set the amount equal to half of 346:
So obviously
So the half life is 15 days.