The exponential function N = 500 × 0.64t, where t is measured in years, shows the amount, in grams, of a certain radioactive substance present.
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.)