In the formula A(t)=A₀e^kt, A is the amount of radioactive material remaining from an initial amount A₀ at a given time? t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.25?% annually. Determine the? half-life of this? isotope, to the nearest year.

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In the formula Mt) = Age\". A is the amount at radioactive material remaining from an initial amount As at a given time t. and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.25% annually. Determine the halflife of this isotope. to the nearest 1year. 0A. 2??yr QB. 33W 00.1205'1' OD. 200w