The exponential function N = 500 × 0.74t, where t is measured in years, shows the amount, in grams, of a certain radioactive substance present. (a) Calculate N(4). (Round your answer to one decimal place.)  Explain what your answer means. After *blank  years there are *blank grams of the radioactive substance present. (b) What is the yearly percentage decay rate? (Round your answer to one decimal place.)

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