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Thirty percent of a radioactive substance decays in four years. By what percent does the substance decay each year?
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Nick has box brads. he uses 4 brads for the first project. nick letβs b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.
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Thirty percent of a radioactive substance decays in four years.
By what percent does the substance...
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