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Goods costing $25.85 at the beginning of the year 1962 cost $163.30 at the beginning of...

Goods costing $25.85 at the beginning of the year 1962 cost $163.30 at the beginning of the year 1990. Find the average annual inflation rate over this time period. Express your answer the nearest thousandth of a percent.

A particular radioactive isotope decays from 190 milligrams (mg) to 152 mg in 15 days. Find the half life of the isotope.
Hint: Find the rate first. The half life of the isotope is the half value of 190 mg then solve for x.
Your answer is  

days.

Math   Statistics-And-Probability   
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