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A decomposition reaction has a rate constant of 0.0012 yr?^-1 (a) What is the half-life of...

A decomposition reaction has a rate constant of 0.0012 yr?^-1 (a) What is the half-life of the reaction? (b) How long does it take for [reactant] to reach 12.5% of its original value?

Please explain step by step, I am confused on how to solve part B mostly! How do you rearrange the formulas to get the answer??

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