One type of lodine disintegrates continuously at a constant rate of 8.6% per day.
Suppose the original amount, P0, is 10 grams, and let be measured in days.
Because the lodine is decaying continuously at a constant rate, we use the model
P = P0e for the decay equation, where k is the rate of continuous decay. Using
the given information, write the decay equation for this type of lodine.