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 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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