A radio-active isotope used in medical imaging has an exponential decay that can be modeled as:
A = A0e-0.25t where A is the amount of the isotope at the end of t hours,
A0 is initial does of isotope given, and t is time (in hours).
How many hours will it take for the ½ of the isotope to decay? Round
answer to the nearest hour.

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step-by-step explanation: