Logarithm word problem help?

Caitlin

New member
I have difficulty with math, and my teacher gave me a little review to do before my quiz tomorrow. Can you please help me with this word problem? I am confused about how to set it up. Do I do y=ab^x form? Also, we do the litle trick with calculators where you do Log/Log, if that changes how you solve it. Here is the problem:

Iodine -141 has a half life of 21 days. What is the decay rate (daily) for Iodine-141?
 
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