The amount of a radioactive substance, y, decays exponentially such that its half-life is 8 days. In other words, the amount of any sample decays to exactly half in that time period. Write a differential equation in terms of y and t, in days, to represent the rate of decrease in the amount of the substance. dy dt dy = 0.1732y dt dy dt = -0.0433y dy dt = -0.1732y : -0.0866y

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