Which equation can be used to solve for the value of x?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

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What is the interquartile range (iqr) of the data set represented by this box plot?