The amount remaining of a radioactive substance after t hours is given by

A(t) = 100ekt. After 12 hours, the initial amount has decreased by 4%.

How much remains after 48 hours?

What is the half-life of the substance?

2 answers

just did a question just like yours
http://www.jiskha.com/display.cgi?id=1448296657

follow the steps

for the half life, set the amount = 50 and solve for t
The amout remaining of a radioactive substance after t hours id given by A(t)=100e^kt. After12hours, the initial amount had decreased by 7%
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