SOLUTION: A radioactive substance has a half-life of 26 months. If after 10 months 42 grams remain, approximate the initial amount to the nearest gram.

Question 324776: A radioactive substance has a half-life of 26 months. If after 10 months 42 grams remain, approximate the initial amount to the nearest gram.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A radioactive substance has a half-life of 26 months.
If after 10 months 42 grams remain, approximate the initial amount to the nearest gram.
:
The half-life formula: A = Ao*2^(-t/h)
where:
A = resulting amt after t
Ao = initial amt
t = time
h = half-life of substance
:
Ao*2^(-10/26) = 42
:
Ao * .76598 = 42
Ao =
Ao = 55 grams
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