This math topic involves solving exponential decay problems related to concentrations of toxins and population sizes. Each question presents a scenario where a toxin or population starts at a specified concentration or size and decreases weekly or yearly by a given percentage. Over a certain period, the final concentration or population size must be calculated using an exponential decay formula. The exponential function primarily takes the form \( C = C_0 \times (1 - r)^t \), where \(C_0\) is the initial concentration or size, \(r\) is the decay rate, and \(t\) is the time elapsed.
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