A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 32 grams. Rounding to five significant digits, write an exponential equation representing this situation in the form: A (t) = Ao ekt Ao = k%3D What is the half-life of this substance (round to the nearest minute)? min How much remains after 2 hours (round to the nearest gram)? gram 11

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