Posted by **claudia** on Friday, May 18, 2007 at 8:01am.

What is the figure that gives the half-life of the isotope in minutes to 4 significant figures?

Exponential regression on a set of data, which gives the amount of atoms of a radioactive isotope remaining after a time X minutes, produced the following output.

ExpReg

y = a*b^x

a = 10001

b = 0.90002

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