6. Model radioactive decay using the notation t = time (independent variable), r(t) = amount of particular radioactive isotope present at time t (dependent variable), -λ = decay rate (parameter). Note that the minus sign is used so that > > 0. (a) Using this notation, write a model for the decay of a particular radioactive iso- tope. = (b) If the amount of the isotope present at t initial-value problem for the model in part (a). 0 is ro, state the corresponding

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