The exponential function N = 500 × 0.64t, where t is measured in years, shows the amount, in grams, of a certain radioactive substance present.
N(4) =
Explain what your answer means.
(b) What is the yearly percentage decay rate? (Round your answer to one decimal place.)
%
(c) What is the monthly decay factor rounded to three decimal places?
What is the monthly percentage decay rate? (Round your answer to one decimal place.)
%
(d) What is the percentage decay rate per second? (Note: For this calculation, you will need to use all the decimal places that your calculator can show. Round your answer to eight decimal places.)
