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Decay of Lead A sample of $$500 g$$ of radioactive lead-210 decays to polonium-210 according to the function $$A ( t ) = 500 e ^ { - 0.032 t }$$
$$\left. \begin{array} { l l l l } { \text { (a) } 440 g } & { \text { (b) } 387 g } & { \text { (c) } 264 g } & { \text { (d) } 21.66 yr } \end{array} \right.$$