ANSWER 5. For questions no. 4 and 5. Given: Radium decomposed at a rate proportional to the quality of radium present. Suppose that it is found that in 25 years approximately 1.10% of a certain quantity of radium has decomposed. Determine approximately how long it will take for 1⁄2 the original amount of radium to decompose. 4. The value of the constant of proportionality is _________________. 5. The amount of unconverted substance at any time t is given by ____________

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